<p>Untersuche die Definitheit von:</p><p> </p><p>\begin{align*}A=\left(\begin{array}{cc}<br />-1 &amp; 3 \\<br />3 &amp; 2<br />\end{array}\right)\end{align*}</p>

<p>Untersuche die Definitheit von:</p><p> </p><p><mjx-container class="MathJax" jax="SVG"><svg alt="\begin{align*}A=\left(\begin{array}{cc}
-1 & 3 \\
3 & 2
\end{array}\right)\end{align*}" style="vertical-align: -2.149ex" xmlns="http://www.w3.org/2000/svg" width="14.329ex" height="5.43ex" role="img" focusable="false" viewBox="0 -1450 6333.6 2400" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><path id="MJX-10886-TEX-I-1D434" d="M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z"></path><path id="MJX-10886-TEX-N-3D" d="M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z"></path><path id="MJX-10886-TEX-S3-28" d="M701 -940Q701 -943 695 -949H664Q662 -947 636 -922T591 -879T537 -818T475 -737T412 -636T350 -511T295 -362T250 -186T221 17T209 251Q209 962 573 1361Q596 1386 616 1405T649 1437T664 1450H695Q701 1444 701 1441Q701 1436 681 1415T629 1356T557 1261T476 1118T400 927T340 675T308 359Q306 321 306 250Q306 -139 400 -430T690 -924Q701 -936 701 -940Z"></path><path id="MJX-10886-TEX-N-2212" d="M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z"></path><path id="MJX-10886-TEX-N-31" d="M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z"></path><path id="MJX-10886-TEX-N-33" d="M127 463Q100 463 85 480T69 524Q69 579 117 622T233 665Q268 665 277 664Q351 652 390 611T430 522Q430 470 396 421T302 350L299 348Q299 347 308 345T337 336T375 315Q457 262 457 175Q457 96 395 37T238 -22Q158 -22 100 21T42 130Q42 158 60 175T105 193Q133 193 151 175T169 130Q169 119 166 110T159 94T148 82T136 74T126 70T118 67L114 66Q165 21 238 21Q293 21 321 74Q338 107 338 175V195Q338 290 274 322Q259 328 213 329L171 330L168 332Q166 335 166 348Q166 366 174 366Q202 366 232 371Q266 376 294 413T322 525V533Q322 590 287 612Q265 626 240 626Q208 626 181 615T143 592T132 580H135Q138 579 143 578T153 573T165 566T175 555T183 540T186 520Q186 498 172 481T127 463Z"></path><path id="MJX-10886-TEX-N-32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z"></path><path id="MJX-10886-TEX-S3-29" d="M34 1438Q34 1446 37 1448T50 1450H56H71Q73 1448 99 1423T144 1380T198 1319T260 1238T323 1137T385 1013T440 864T485 688T514 485T526 251Q526 134 519 53Q472 -519 162 -860Q139 -885 119 -904T86 -936T71 -949H56Q43 -949 39 -947T34 -937Q88 -883 140 -813Q428 -430 428 251Q428 453 402 628T338 922T245 1146T145 1309T46 1425Q44 1427 42 1429T39 1433T36 1436L34 1438Z"></path></defs><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="matrix(1 0 0 -1 0 0)"><g data-mml-node="math"><g data-mml-node="mtable"><g data-mml-node="mtr"><g data-mml-node="mtd"><g data-mml-node="mi"><use xlink:href="#MJX-10886-TEX-I-1D434"></use></g><g data-mml-node="mo" transform="translate(1027.8, 0)"><use xlink:href="#MJX-10886-TEX-N-3D"></use></g><g data-mml-node="mrow" transform="translate(2083.6, 0)"><g data-mml-node="mo"><use xlink:href="#MJX-10886-TEX-S3-28"></use></g><g data-mml-node="mtable" transform="translate(736, 0)"><g data-mml-node="mtr" transform="translate(0, 700)"><g data-mml-node="mtd"><g data-mml-node="mo"><use xlink:href="#MJX-10886-TEX-N-2212"></use></g><g data-mml-node="mn" transform="translate(778, 0)"><use xlink:href="#MJX-10886-TEX-N-31"></use></g></g><g data-mml-node="mtd" transform="translate(2278, 0)"><g data-mml-node="mn"><use xlink:href="#MJX-10886-TEX-N-33"></use></g></g></g><g data-mml-node="mtr" transform="translate(0, -700)"><g data-mml-node="mtd" transform="translate(389, 0)"><g data-mml-node="mn"><use xlink:href="#MJX-10886-TEX-N-33"></use></g></g><g data-mml-node="mtd" transform="translate(2278, 0)"><g data-mml-node="mn"><use xlink:href="#MJX-10886-TEX-N-32"></use></g></g></g></g><g data-mml-node="mo" transform="translate(3514, 0)"><use xlink:href="#MJX-10886-TEX-S3-29"></use></g></g></g></g></g></g></g></svg></mjx-container></p>

<p>Untersuche die Definitheit von:</p>
<p>\[\begin{align*}A=\left(\begin{array}{cccc}<br />-2 &amp; 0 &amp; 0 &amp; 0 \\<br />0 &amp; 0 &amp; 0 &amp; 0 \\<br />0 &amp; 0 &amp; -\frac{1}{6} &amp; 0 \\<br />0 &amp; 0 &amp; 0 &amp; -7<br />\end{array}\right)\end{align*}\]</p>

<p>Untersuche die Definitheit von:</p>
<p><mjx-container class="MathJax" jax="SVG" display="true" justify="left"><svg alt="\begin{align*}A=\left(\begin{array}{cccc}
-2 & 0 & 0 & 0 \\
0 & 0 & 0 & 0 \\
0 & 0 & -\frac{1}{6} & 0 \\
0 & 0 & 0 & -7
\end{array}\right)\end{align*}" style="vertical-align: -5.572ex;" xmlns="http://www.w3.org/2000/svg" width="25.93ex" height="12.275ex" role="img" focusable="false" viewBox="0 -2962.7 11461.1 5425.5" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><path id="MJX-1-TEX-I-1D434" d="M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z"></path><path id="MJX-1-TEX-N-3D" d="M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z"></path><path id="MJX-1-TEX-S4-239B" d="M837 1154Q843 1148 843 1145Q843 1141 818 1106T753 1002T667 841T574 604T494 299Q417 -84 417 -609Q417 -641 416 -647T411 -654Q409 -655 366 -655Q299 -655 297 -654Q292 -652 292 -643T291 -583Q293 -400 304 -242T347 110T432 470T574 813T785 1136Q787 1139 790 1142T794 1147T796 1150T799 1152T802 1153T807 1154T813 1154H819H837Z"></path><path id="MJX-1-TEX-S4-239D" d="M843 -635Q843 -638 837 -644H820Q801 -644 800 -643Q792 -635 785 -626Q684 -503 605 -363T473 -75T385 216T330 518T302 809T291 1093Q291 1144 291 1153T296 1164Q298 1165 366 1165Q409 1165 411 1164Q415 1163 416 1157T417 1119Q417 529 517 109T833 -617Q843 -631 843 -635Z"></path><path id="MJX-1-TEX-S4-239C" d="M413 -9Q412 -9 407 -9T388 -10T354 -10Q300 -10 297 -9Q294 -8 293 -5Q291 5 291 127V300Q291 602 292 605L296 609Q298 610 366 610Q382 610 392 610T407 610T412 609Q416 609 416 592T417 473V127Q417 -9 413 -9Z"></path><path id="MJX-1-TEX-N-2212" d="M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z"></path><path id="MJX-1-TEX-N-32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z"></path><path id="MJX-1-TEX-N-30" d="M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z"></path><path id="MJX-1-TEX-N-31" d="M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 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40Q168 198 265 368Q285 400 349 489L395 552H302Q128 552 119 546Q113 543 108 522T98 479L95 458V455H55V458Z"></path><path id="MJX-1-TEX-S4-239E" d="M31 1143Q31 1154 49 1154H59Q72 1154 75 1152T89 1136Q190 1013 269 873T401 585T489 294T544 -8T572 -299T583 -583Q583 -634 583 -643T577 -654Q575 -655 508 -655Q465 -655 463 -654Q459 -653 458 -647T457 -609Q457 -58 371 340T100 1037Q87 1059 61 1098T31 1143Z"></path><path id="MJX-1-TEX-S4-23A0" d="M56 -644H50Q31 -644 31 -635Q31 -632 37 -622Q69 -579 100 -527Q286 -228 371 170T457 1119Q457 1161 462 1164Q464 1165 520 1165Q575 1165 577 1164Q582 1162 582 1153T583 1093Q581 910 570 752T527 400T442 40T300 -303T89 -626Q78 -640 75 -642T61 -644H56Z"></path><path id="MJX-1-TEX-S4-239F" d="M579 -9Q578 -9 573 -9T554 -10T520 -10Q466 -10 463 -9Q460 -8 459 -5Q457 5 457 127V300Q457 602 458 605L462 609Q464 610 532 610Q548 610 558 610T573 610T578 609Q582 609 582 592T583 473V127Q583 -9 579 -9Z"></path></defs><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mtable"><g data-mml-node="mtr"><g data-mml-node="mtd"><g data-mml-node="mi"><use data-c="1D434" xlink:href="#MJX-1-TEX-I-1D434"></use></g><g data-mml-node="mo" transform="translate(1027.8,0)"><use data-c="3D" xlink:href="#MJX-1-TEX-N-3D"></use></g><g data-mml-node="mrow" transform="translate(2083.6,0)"><g data-mml-node="mo"><use data-c="239B" xlink:href="#MJX-1-TEX-S4-239B" transform="translate(0,1808.7)"></use><use data-c="239D" xlink:href="#MJX-1-TEX-S4-239D" transform="translate(0,-1818.7)"></use><svg width="875" height="2007.5" y="-753.7" x="0" viewBox="0 453.3 875 2007.5"><use data-c="239C" xlink:href="#MJX-1-TEX-S4-239C" transform="scale(1,4.857)"></use></svg></g><g data-mml-node="mtable" transform="translate(875,0)"><g data-mml-node="mtr" transform="translate(0,2212.7)"><g data-mml-node="mtd"><g data-mml-node="mo"><use data-c="2212" xlink:href="#MJX-1-TEX-N-2212"></use></g><g data-mml-node="mn" transform="translate(778,0)"><use data-c="32" xlink:href="#MJX-1-TEX-N-32"></use></g></g><g data-mml-node="mtd" transform="translate(2278,0)"><g data-mml-node="mn"><use data-c="30" xlink:href="#MJX-1-TEX-N-30"></use></g></g><g data-mml-node="mtd" transform="translate(4313.8,0)"><g data-mml-node="mn"><use data-c="30" xlink:href="#MJX-1-TEX-N-30"></use></g></g><g data-mml-node="mtd" transform="translate(6738.6,0)"><g data-mml-node="mn"><use data-c="30" xlink:href="#MJX-1-TEX-N-30"></use></g></g></g><g data-mml-node="mtr" transform="translate(0,812.7)"><g data-mml-node="mtd" transform="translate(389,0)"><g data-mml-node="mn"><use data-c="30" xlink:href="#MJX-1-TEX-N-30"></use></g></g><g data-mml-node="mtd" transform="translate(2278,0)"><g data-mml-node="mn"><use data-c="30" xlink:href="#MJX-1-TEX-N-30"></use></g></g><g data-mml-node="mtd" transform="translate(4313.8,0)"><g data-mml-node="mn"><use data-c="30" xlink:href="#MJX-1-TEX-N-30"></use></g></g><g data-mml-node="mtd" transform="translate(6738.6,0)"><g data-mml-node="mn"><use data-c="30" xlink:href="#MJX-1-TEX-N-30"></use></g></g></g><g data-mml-node="mtr" transform="translate(0,-702.2)"><g data-mml-node="mtd" transform="translate(389,0)"><g data-mml-node="mn"><use data-c="30" xlink:href="#MJX-1-TEX-N-30"></use></g></g><g data-mml-node="mtd" transform="translate(2278,0)"><g data-mml-node="mn"><use data-c="30" xlink:href="#MJX-1-TEX-N-30"></use></g></g><g data-mml-node="mtd" transform="translate(3778,0)"><g data-mml-node="mo"><use data-c="2212" xlink:href="#MJX-1-TEX-N-2212"></use></g><g data-mml-node="mfrac" transform="translate(778,0)"><g data-mml-node="mn" transform="translate(220,394) scale(0.707)"><use data-c="31" xlink:href="#MJX-1-TEX-N-31"></use></g><g data-mml-node="mn" transform="translate(220,-345) scale(0.707)"><use data-c="36" xlink:href="#MJX-1-TEX-N-36"></use></g><rect width="553.6" height="60" x="120" y="220"></rect></g></g><g data-mml-node="mtd" transform="translate(6738.6,0)"><g data-mml-node="mn"><use data-c="30" xlink:href="#MJX-1-TEX-N-30"></use></g></g></g><g data-mml-node="mtr" transform="translate(0,-2212.7)"><g data-mml-node="mtd" transform="translate(389,0)"><g data-mml-node="mn"><use data-c="30" xlink:href="#MJX-1-TEX-N-30"></use></g></g><g data-mml-node="mtd" transform="translate(2278,0)"><g data-mml-node="mn"><use data-c="30" xlink:href="#MJX-1-TEX-N-30"></use></g></g><g data-mml-node="mtd" transform="translate(4313.8,0)"><g data-mml-node="mn"><use data-c="30" xlink:href="#MJX-1-TEX-N-30"></use></g></g><g data-mml-node="mtd" transform="translate(6349.6,0)"><g data-mml-node="mo"><use data-c="2212" xlink:href="#MJX-1-TEX-N-2212"></use></g><g data-mml-node="mn" transform="translate(778,0)"><use data-c="37" xlink:href="#MJX-1-TEX-N-37"></use></g></g></g></g><g data-mml-node="mo" transform="translate(8502.6,0)"><use data-c="239E" xlink:href="#MJX-1-TEX-S4-239E" transform="translate(0,1808.7)"></use><use data-c="23A0" xlink:href="#MJX-1-TEX-S4-23A0" transform="translate(0,-1818.7)"></use><svg width="875" height="2007.5" y="-753.7" x="0" viewBox="0 453.3 875 2007.5"><use data-c="239F" xlink:href="#MJX-1-TEX-S4-239F" transform="scale(1,4.857)"></use></svg></g></g></g></g></g></g></g></svg></mjx-container></p>

<p>Prüfe ob die folgende Matrix $A$ positiv definit ist:</p><p> </p><p>$$A=\left(\begin{array}{ccc}<br />-5 &amp; 0 &amp; 0 \\<br />0 &amp; 0 &amp; 0 \\<br />0 &amp; 0 &amp; 1<br />\end{array}\right)$$</p>

<p>Prüfe ob die folgende Matrix <mjx-container class="MathJax" jax="SVG"><svg alt="A" style="vertical-align: 0" xmlns="http://www.w3.org/2000/svg" width="1.697ex" height="1.62ex" role="img" focusable="false" viewBox="0 -716 750 716" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><path id="MJX-10915-TEX-I-1D434" d="M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z"></path></defs><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="matrix(1 0 0 -1 0 0)"><g data-mml-node="math"><g data-mml-node="mi"><use xlink:href="#MJX-10915-TEX-I-1D434"></use></g></g></g></svg></mjx-container> positiv definit ist:</p><p> </p><p><mjx-container class="MathJax" jax="SVG" display="true" justify="left"><svg alt="A=\left(\begin{array}{ccc}
-5 & 0 & 0 \\
0 & 0 & 0 \\
0 & 0 & 1
\end{array}\right)" style="vertical-align: -3.733ex" xmlns="http://www.w3.org/2000/svg" width="18.352ex" height="8.597ex" role="img" focusable="false" viewBox="0 -2150 8111.6 3800" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><path id="MJX-10916-TEX-I-1D434" d="M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z"></path><path id="MJX-10916-TEX-N-3D" d="M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z"></path><path 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<p>Untersuche die Definitheit von:</p><p> </p><p>\begin{align*}A=\left(\begin{array}{lll}<br />0 &amp; 0 &amp; 0 \\<br />0 &amp; 1 &amp; 1 \\<br />0 &amp; 1 &amp; 2<br />\end{array}\right)\end{align*}</p>

<p>Untersuche die Definitheit von:</p><p> </p><p><mjx-container class="MathJax" jax="SVG"><svg alt="\begin{align*}A=\left(\begin{array}{lll}
0 & 0 & 0 \\
0 & 1 & 1 \\
0 & 1 & 2
\end{array}\right)\end{align*}" style="vertical-align: -3.733ex" xmlns="http://www.w3.org/2000/svg" width="16.592ex" height="8.597ex" role="img" focusable="false" viewBox="0 -2150 7333.6 3800" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><path id="MJX-10895-TEX-I-1D434" d="M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z"></path><path id="MJX-10895-TEX-N-3D" d="M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z"></path><path id="MJX-10895-TEX-S4-239B" d="M837 1154Q843 1148 843 1145Q843 1141 818 1106T753 1002T667 841T574 604T494 299Q417 -84 417 -609Q417 -641 416 -647T411 -654Q409 -655 366 -655Q299 -655 297 -654Q292 -652 292 -643T291 -583Q293 -400 304 -242T347 110T432 470T574 813T785 1136Q787 1139 790 1142T794 1147T796 1150T799 1152T802 1153T807 1154T813 1154H819H837Z"></path><path id="MJX-10895-TEX-S4-239D" d="M843 -635Q843 -638 837 -644H820Q801 -644 800 -643Q792 -635 785 -626Q684 -503 605 -363T473 -75T385 216T330 518T302 809T291 1093Q291 1144 291 1153T296 1164Q298 1165 366 1165Q409 1165 411 1164Q415 1163 416 1157T417 1119Q417 529 517 109T833 -617Q843 -631 843 -635Z"></path><path id="MJX-10895-TEX-S4-239C" d="M413 -9Q412 -9 407 -9T388 -10T354 -10Q300 -10 297 -9Q294 -8 293 -5Q291 5 291 127V300Q291 602 292 605L296 609Q298 610 366 610Q382 610 392 610T407 610T412 609Q416 609 416 592T417 473V127Q417 -9 413 -9Z"></path><path id="MJX-10895-TEX-N-30" d="M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z"></path><path id="MJX-10895-TEX-N-31" d="M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z"></path><path id="MJX-10895-TEX-N-32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z"></path><path id="MJX-10895-TEX-S4-239E" d="M31 1143Q31 1154 49 1154H59Q72 1154 75 1152T89 1136Q190 1013 269 873T401 585T489 294T544 -8T572 -299T583 -583Q583 -634 583 -643T577 -654Q575 -655 508 -655Q465 -655 463 -654Q459 -653 458 -647T457 -609Q457 -58 371 340T100 1037Q87 1059 61 1098T31 1143Z"></path><path id="MJX-10895-TEX-S4-23A0" d="M56 -644H50Q31 -644 31 -635Q31 -632 37 -622Q69 -579 100 -527Q286 -228 371 170T457 1119Q457 1161 462 1164Q464 1165 520 1165Q575 1165 577 1164Q582 1162 582 1153T583 1093Q581 910 570 752T527 400T442 40T300 -303T89 -626Q78 -640 75 -642T61 -644H56Z"></path><path id="MJX-10895-TEX-S4-239F" d="M579 -9Q578 -9 573 -9T554 -10T520 -10Q466 -10 463 -9Q460 -8 459 -5Q457 5 457 127V300Q457 602 458 605L462 609Q464 610 532 610Q548 610 558 610T573 610T578 609Q582 609 582 592T583 473V127Q583 -9 579 -9Z"></path></defs><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="matrix(1 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transform="translate(4375, 0)"><use xlink:href="#MJX-10895-TEX-S4-239E" transform="translate(0, 996)"></use><use xlink:href="#MJX-10895-TEX-S4-23A0" transform="translate(0, -1006)"></use><svg width="875" height="382" y="59" x="0" viewBox="0 86.3 875 382"><use xlink:href="#MJX-10895-TEX-S4-239F" transform="scale(1, 0.924)"></use></svg></g></g></g></g></g></g></g></svg></mjx-container></p>

<p>Prüfe ob die folgende Matrix $A$ positiv definit ist:</p><p> </p><p>$$A=\left(\begin{array}{ccc}3 &amp; -1 &amp; 0 \\ -1 &amp; 2 &amp; -1 \\ 0 &amp; -1 &amp; 3\end{array}\right)$$</p>

<p>Prüfe ob die folgende Matrix <mjx-container class="MathJax" jax="SVG"><svg alt="A" style="vertical-align: 0" xmlns="http://www.w3.org/2000/svg" width="1.697ex" height="1.62ex" role="img" focusable="false" viewBox="0 -716 750 716" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><path id="MJX-10909-TEX-I-1D434" d="M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z"></path></defs><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="matrix(1 0 0 -1 0 0)"><g data-mml-node="math"><g data-mml-node="mi"><use xlink:href="#MJX-10909-TEX-I-1D434"></use></g></g></g></svg></mjx-container> positiv definit ist:</p><p> </p><p><mjx-container class="MathJax" jax="SVG" display="true" justify="left"><svg alt="A=\left(\begin{array}{ccc}3 & -1 & 0 \\ -1 & 2 & -1 \\ 0 & -1 & 3\end{array}\right)" style="vertical-align: -3.733ex" xmlns="http://www.w3.org/2000/svg" width="21.872ex" height="8.597ex" role="img" focusable="false" viewBox="0 -2150 9667.6 3800" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><path id="MJX-10910-TEX-I-1D434" d="M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z"></path><path id="MJX-10910-TEX-N-3D" d="M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z"></path><path id="MJX-10910-TEX-S4-239B" d="M837 1154Q843 1148 843 1145Q843 1141 818 1106T753 1002T667 841T574 604T494 299Q417 -84 417 -609Q417 -641 416 -647T411 -654Q409 -655 366 -655Q299 -655 297 -654Q292 -652 292 -643T291 -583Q293 -400 304 -242T347 110T432 470T574 813T785 1136Q787 1139 790 1142T794 1147T796 1150T799 1152T802 1153T807 1154T813 1154H819H837Z"></path><path id="MJX-10910-TEX-S4-239D" d="M843 -635Q843 -638 837 -644H820Q801 -644 800 -643Q792 -635 785 -626Q684 -503 605 -363T473 -75T385 216T330 518T302 809T291 1093Q291 1144 291 1153T296 1164Q298 1165 366 1165Q409 1165 411 1164Q415 1163 416 1157T417 1119Q417 529 517 109T833 -617Q843 -631 843 -635Z"></path><path id="MJX-10910-TEX-S4-239C" d="M413 -9Q412 -9 407 -9T388 -10T354 -10Q300 -10 297 -9Q294 -8 293 -5Q291 5 291 127V300Q291 602 292 605L296 609Q298 610 366 610Q382 610 392 610T407 610T412 609Q416 609 416 592T417 473V127Q417 -9 413 -9Z"></path><path id="MJX-10910-TEX-N-33" d="M127 463Q100 463 85 480T69 524Q69 579 117 622T233 665Q268 665 277 664Q351 652 390 611T430 522Q430 470 396 421T302 350L299 348Q299 347 308 345T337 336T375 315Q457 262 457 175Q457 96 395 37T238 -22Q158 -22 100 21T42 130Q42 158 60 175T105 193Q133 193 151 175T169 130Q169 119 166 110T159 94T148 82T136 74T126 70T118 67L114 66Q165 21 238 21Q293 21 321 74Q338 107 338 175V195Q338 290 274 322Q259 328 213 329L171 330L168 332Q166 335 166 348Q166 366 174 366Q202 366 232 371Q266 376 294 413T322 525V533Q322 590 287 612Q265 626 240 626Q208 626 181 615T143 592T132 580H135Q138 579 143 578T153 573T165 566T175 555T183 540T186 520Q186 498 172 481T127 463Z"></path><path id="MJX-10910-TEX-N-2212" d="M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z"></path><path id="MJX-10910-TEX-N-31" d="M213 578L200 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573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z"></path><path id="MJX-10910-TEX-S4-239E" d="M31 1143Q31 1154 49 1154H59Q72 1154 75 1152T89 1136Q190 1013 269 873T401 585T489 294T544 -8T572 -299T583 -583Q583 -634 583 -643T577 -654Q575 -655 508 -655Q465 -655 463 -654Q459 -653 458 -647T457 -609Q457 -58 371 340T100 1037Q87 1059 61 1098T31 1143Z"></path><path id="MJX-10910-TEX-S4-23A0" d="M56 -644H50Q31 -644 31 -635Q31 -632 37 -622Q69 -579 100 -527Q286 -228 371 170T457 1119Q457 1161 462 1164Q464 1165 520 1165Q575 1165 577 1164Q582 1162 582 1153T583 1093Q581 910 570 752T527 400T442 40T300 -303T89 -626Q78 -640 75 -642T61 -644H56Z"></path><path id="MJX-10910-TEX-S4-239F" d="M579 -9Q578 -9 573 -9T554 -10T520 -10Q466 -10 463 -9Q460 -8 459 -5Q457 5 457 127V300Q457 602 458 605L462 609Q464 610 532 610Q548 610 558 610T573 610T578 609Q582 609 582 592T583 473V127Q583 -9 579 -9Z"></path></defs><g stroke="currentColor" fill="currentColor" 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xlink:href="#MJX-10910-TEX-N-2212"></use></g><g data-mml-node="mn" transform="translate(778, 0)"><use xlink:href="#MJX-10910-TEX-N-31"></use></g></g><g data-mml-node="mtd" transform="translate(4945, 0)"><g data-mml-node="mn"><use xlink:href="#MJX-10910-TEX-N-30"></use></g></g></g><g data-mml-node="mtr"><g data-mml-node="mtd"><g data-mml-node="mo"><use xlink:href="#MJX-10910-TEX-N-2212"></use></g><g data-mml-node="mn" transform="translate(778, 0)"><use xlink:href="#MJX-10910-TEX-N-31"></use></g></g><g data-mml-node="mtd" transform="translate(2667, 0)"><g data-mml-node="mn"><use xlink:href="#MJX-10910-TEX-N-32"></use></g></g><g data-mml-node="mtd" transform="translate(4556, 0)"><g data-mml-node="mo"><use xlink:href="#MJX-10910-TEX-N-2212"></use></g><g data-mml-node="mn" transform="translate(778, 0)"><use xlink:href="#MJX-10910-TEX-N-31"></use></g></g></g><g data-mml-node="mtr" transform="translate(0, -1400)"><g data-mml-node="mtd" transform="translate(389, 0)"><g data-mml-node="mn"><use xlink:href="#MJX-10910-TEX-N-30"></use></g></g><g data-mml-node="mtd" transform="translate(2278, 0)"><g data-mml-node="mo"><use xlink:href="#MJX-10910-TEX-N-2212"></use></g><g data-mml-node="mn" transform="translate(778, 0)"><use xlink:href="#MJX-10910-TEX-N-31"></use></g></g><g data-mml-node="mtd" transform="translate(4945, 0)"><g data-mml-node="mn"><use xlink:href="#MJX-10910-TEX-N-33"></use></g></g></g></g><g data-mml-node="mo" transform="translate(6709, 0)"><use xlink:href="#MJX-10910-TEX-S4-239E" transform="translate(0, 996)"></use><use xlink:href="#MJX-10910-TEX-S4-23A0" transform="translate(0, -1006)"></use><svg width="875" height="382" y="59" x="0" viewBox="0 86.3 875 382"><use xlink:href="#MJX-10910-TEX-S4-239F" transform="scale(1, 0.924)"></use></svg></g></g></g></g></svg></mjx-container></p>

<p>Prüfe ob die folgende Matrix $A$ positiv definit ist:</p><p> </p><p>$$A=\left(\begin{array}{lll}<br />6 &amp; 7 &amp; 1 \\<br />7 &amp; 9 &amp; 2 \\<br />1 &amp; 2 &amp; 1<br />\end{array}\right)$$</p>

<p>Prüfe ob die folgende Matrix <mjx-container class="MathJax" jax="SVG"><svg alt="A" style="vertical-align: 0" xmlns="http://www.w3.org/2000/svg" width="1.697ex" height="1.62ex" role="img" focusable="false" viewBox="0 -716 750 716" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><path id="MJX-10919-TEX-I-1D434" d="M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z"></path></defs><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="matrix(1 0 0 -1 0 0)"><g data-mml-node="math"><g data-mml-node="mi"><use xlink:href="#MJX-10919-TEX-I-1D434"></use></g></g></g></svg></mjx-container> positiv definit ist:</p><p> </p><p><mjx-container class="MathJax" jax="SVG" display="true" justify="left"><svg alt="A=\left(\begin{array}{lll}
6 & 7 & 1 \\
7 & 9 & 2 \\
1 & 2 & 1
\end{array}\right)" style="vertical-align: -3.733ex" xmlns="http://www.w3.org/2000/svg" width="16.592ex" height="8.597ex" role="img" focusable="false" viewBox="0 -2150 7333.6 3800" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><path id="MJX-10920-TEX-I-1D434" d="M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z"></path><path id="MJX-10920-TEX-N-3D" d="M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z"></path><path id="MJX-10920-TEX-S4-239B" d="M837 1154Q843 1148 843 1145Q843 1141 818 1106T753 1002T667 841T574 604T494 299Q417 -84 417 -609Q417 -641 416 -647T411 -654Q409 -655 366 -655Q299 -655 297 -654Q292 -652 292 -643T291 -583Q293 -400 304 -242T347 110T432 470T574 813T785 1136Q787 1139 790 1142T794 1147T796 1150T799 1152T802 1153T807 1154T813 1154H819H837Z"></path><path id="MJX-10920-TEX-S4-239D" d="M843 -635Q843 -638 837 -644H820Q801 -644 800 -643Q792 -635 785 -626Q684 -503 605 -363T473 -75T385 216T330 518T302 809T291 1093Q291 1144 291 1153T296 1164Q298 1165 366 1165Q409 1165 411 1164Q415 1163 416 1157T417 1119Q417 529 517 109T833 -617Q843 -631 843 -635Z"></path><path id="MJX-10920-TEX-S4-239C" d="M413 -9Q412 -9 407 -9T388 -10T354 -10Q300 -10 297 -9Q294 -8 293 -5Q291 5 291 127V300Q291 602 292 605L296 609Q298 610 366 610Q382 610 392 610T407 610T412 609Q416 609 416 592T417 473V127Q417 -9 413 -9Z"></path><path id="MJX-10920-TEX-N-36" d="M42 313Q42 476 123 571T303 666Q372 666 402 630T432 550Q432 525 418 510T379 495Q356 495 341 509T326 548Q326 592 373 601Q351 623 311 626Q240 626 194 566Q147 500 147 364L148 360Q153 366 156 373Q197 433 263 433H267Q313 433 348 414Q372 400 396 374T435 317Q456 268 456 210V192Q456 169 451 149Q440 90 387 34T253 -22Q225 -22 199 -14T143 16T92 75T56 172T42 313ZM257 397Q227 397 205 380T171 335T154 278T148 216Q148 133 160 97T198 39Q222 21 251 21Q302 21 329 59Q342 77 347 104T352 209Q352 289 347 316T329 361Q302 397 257 397Z"></path><path id="MJX-10920-TEX-N-37" d="M55 458Q56 460 72 567L88 674Q88 676 108 676H128V672Q128 662 143 655T195 646T364 644H485V605L417 512Q408 500 387 472T360 435T339 403T319 367T305 330T292 284T284 230T278 162T275 80Q275 66 275 52T274 28V19Q270 2 255 -10T221 -22Q210 -22 200 -19T179 0T168 40Q168 198 265 368Q285 400 349 489L395 552H302Q128 552 119 546Q113 543 108 522T98 479L95 458V455H55V458Z"></path><path id="MJX-10920-TEX-N-31" d="M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z"></path><path id="MJX-10920-TEX-N-39" d="M352 287Q304 211 232 211Q154 211 104 270T44 396Q42 412 42 436V444Q42 537 111 606Q171 666 243 666Q245 666 249 666T257 665H261Q273 665 286 663T323 651T370 619T413 560Q456 472 456 334Q456 194 396 97Q361 41 312 10T208 -22Q147 -22 108 7T68 93T121 149Q143 149 158 135T173 96Q173 78 164 65T148 49T135 44L131 43Q131 41 138 37T164 27T206 22H212Q272 22 313 86Q352 142 352 280V287ZM244 248Q292 248 321 297T351 430Q351 508 343 542Q341 552 337 562T323 588T293 615T246 625Q208 625 181 598Q160 576 154 546T147 441Q147 358 152 329T172 282Q197 248 244 248Z"></path><path id="MJX-10920-TEX-N-32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z"></path><path id="MJX-10920-TEX-S4-239E" d="M31 1143Q31 1154 49 1154H59Q72 1154 75 1152T89 1136Q190 1013 269 873T401 585T489 294T544 -8T572 -299T583 -583Q583 -634 583 -643T577 -654Q575 -655 508 -655Q465 -655 463 -654Q459 -653 458 -647T457 -609Q457 -58 371 340T100 1037Q87 1059 61 1098T31 1143Z"></path><path id="MJX-10920-TEX-S4-23A0" d="M56 -644H50Q31 -644 31 -635Q31 -632 37 -622Q69 -579 100 -527Q286 -228 371 170T457 1119Q457 1161 462 1164Q464 1165 520 1165Q575 1165 577 1164Q582 1162 582 1153T583 1093Q581 910 570 752T527 400T442 40T300 -303T89 -626Q78 -640 75 -642T61 -644H56Z"></path><path id="MJX-10920-TEX-S4-239F" d="M579 -9Q578 -9 573 -9T554 -10T520 -10Q466 -10 463 -9Q460 -8 459 -5Q457 5 457 127V300Q457 602 458 605L462 609Q464 610 532 610Q548 610 558 610T573 610T578 609Q582 609 582 592T583 473V127Q583 -9 579 -9Z"></path></defs><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="matrix(1 0 0 -1 0 0)"><g data-mml-node="math"><g data-mml-node="mi"><use xlink:href="#MJX-10920-TEX-I-1D434"></use></g><g data-mml-node="mo" transform="translate(1027.8, 0)"><use xlink:href="#MJX-10920-TEX-N-3D"></use></g><g data-mml-node="mrow" transform="translate(2083.6, 0)"><g data-mml-node="mo"><use xlink:href="#MJX-10920-TEX-S4-239B" transform="translate(0, 996)"></use><use xlink:href="#MJX-10920-TEX-S4-239D" transform="translate(0, -1006)"></use><svg width="875" height="382" y="59" x="0" viewBox="0 86.3 875 382"><use xlink:href="#MJX-10920-TEX-S4-239C" transform="scale(1, 0.924)"></use></svg></g><g data-mml-node="mtable" transform="translate(875, 0)"><g data-mml-node="mtr" transform="translate(0, 1400)"><g data-mml-node="mtd"><g data-mml-node="mn"><use xlink:href="#MJX-10920-TEX-N-36"></use></g></g><g data-mml-node="mtd" transform="translate(1500, 0)"><g data-mml-node="mn"><use xlink:href="#MJX-10920-TEX-N-37"></use></g></g><g data-mml-node="mtd" transform="translate(3000, 0)"><g data-mml-node="mn"><use xlink:href="#MJX-10920-TEX-N-31"></use></g></g></g><g data-mml-node="mtr"><g data-mml-node="mtd"><g data-mml-node="mn"><use xlink:href="#MJX-10920-TEX-N-37"></use></g></g><g data-mml-node="mtd" transform="translate(1500, 0)"><g data-mml-node="mn"><use xlink:href="#MJX-10920-TEX-N-39"></use></g></g><g data-mml-node="mtd" transform="translate(3000, 0)"><g data-mml-node="mn"><use xlink:href="#MJX-10920-TEX-N-32"></use></g></g></g><g data-mml-node="mtr" transform="translate(0, -1400)"><g data-mml-node="mtd"><g data-mml-node="mn"><use xlink:href="#MJX-10920-TEX-N-31"></use></g></g><g data-mml-node="mtd" transform="translate(1500, 0)"><g data-mml-node="mn"><use xlink:href="#MJX-10920-TEX-N-32"></use></g></g><g data-mml-node="mtd" transform="translate(3000, 0)"><g data-mml-node="mn"><use xlink:href="#MJX-10920-TEX-N-31"></use></g></g></g></g><g data-mml-node="mo" transform="translate(4375, 0)"><use xlink:href="#MJX-10920-TEX-S4-239E" transform="translate(0, 996)"></use><use xlink:href="#MJX-10920-TEX-S4-23A0" transform="translate(0, -1006)"></use><svg width="875" height="382" y="59" x="0" viewBox="0 86.3 875 382"><use xlink:href="#MJX-10920-TEX-S4-239F" transform="scale(1, 0.924)"></use></svg></g></g></g></g></svg></mjx-container></p>

<p>Berechne alle Hauptminoren und entscheide anschließend ob die Matrix positiv definit ist.</p>
<p> </p>
<p>$$A=\begin{align*}\left(\begin{array}{ccc}<br />-1 &amp; 1 &amp; \sqrt{2} \\<br />1 &amp; -1 &amp; \sqrt{2} \\<br />\sqrt{2} &amp; \sqrt{2} &amp; 0<br />\end{array}\right)\end{align*}$$</p>

<p>Berechne alle Hauptminoren und entscheide anschließend ob die Matrix positiv definit ist.</p>
<p> </p>
<p><mjx-container class="MathJax" jax="SVG" display="true" justify="left"><svg alt="A=\begin{align*}\left(\begin{array}{ccc}
-1 & 1 & \sqrt{2} \\
1 & -1 & \sqrt{2} \\
\sqrt{2} & \sqrt{2} & 0
\end{array}\right)\end{align*}" style="vertical-align: -4.447ex" xmlns="http://www.w3.org/2000/svg" width="21.753ex" height="10.026ex" role="img" focusable="false" viewBox="0 -2465.8 9614.8 4431.5" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><path id="MJX-10924-TEX-I-1D434" d="M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z"></path><path id="MJX-10924-TEX-N-3D" d="M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z"></path><path id="MJX-10924-TEX-S4-239B" d="M837 1154Q843 1148 843 1145Q843 1141 818 1106T753 1002T667 841T574 604T494 299Q417 -84 417 -609Q417 -641 416 -647T411 -654Q409 -655 366 -655Q299 -655 297 -654Q292 -652 292 -643T291 -583Q293 -400 304 -242T347 110T432 470T574 813T785 1136Q787 1139 790 1142T794 1147T796 1150T799 1152T802 1153T807 1154T813 1154H819H837Z"></path><path id="MJX-10924-TEX-S4-239D" d="M843 -635Q843 -638 837 -644H820Q801 -644 800 -643Q792 -635 785 -626Q684 -503 605 -363T473 -75T385 216T330 518T302 809T291 1093Q291 1144 291 1153T296 1164Q298 1165 366 1165Q409 1165 411 1164Q415 1163 416 1157T417 1119Q417 529 517 109T833 -617Q843 -631 843 -635Z"></path><path id="MJX-10924-TEX-S4-239C" d="M413 -9Q412 -9 407 -9T388 -10T354 -10Q300 -10 297 -9Q294 -8 293 -5Q291 5 291 127V300Q291 602 292 605L296 609Q298 610 366 610Q382 610 392 610T407 610T412 609Q416 609 416 592T417 473V127Q417 -9 413 -9Z"></path><path id="MJX-10924-TEX-N-2212" d="M84 237T84 250T98 270H679Q694 262 694 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<p>Finde alle Werte für $a \in \mathbb{R}$, für welche die Matrix $A$ positiv definit ist.</p>
<p> </p>
<p>\begin{align*}</p>
<p>A=\left(\begin{array}{cccc}<br />1 &amp; 0 &amp; a &amp; 0 \\<br />0 &amp; 3 &amp; -2 &amp; 1 \\<br />a &amp; -2 &amp; 2 &amp; 0 \\<br />0 &amp; 1 &amp; 0 &amp; 7<br />\end{array}\right)\end{align*}</p>

<p>Finde alle Werte für <mjx-container class="MathJax" jax="SVG"><svg alt="a \in \mathbb{R}" style="vertical-align: -0.09ex" xmlns="http://www.w3.org/2000/svg" width="5.596ex" height="1.636ex" role="img" focusable="false" viewBox="0 -683 2473.6 723" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><path id="MJX-10928-TEX-I-1D44E" d="M33 157Q33 258 109 349T280 441Q331 441 370 392Q386 422 416 422Q429 422 439 414T449 394Q449 381 412 234T374 68Q374 43 381 35T402 26Q411 27 422 35Q443 55 463 131Q469 151 473 152Q475 153 483 153H487Q506 153 506 144Q506 138 501 117T481 63T449 13Q436 0 417 -8Q409 -10 393 -10Q359 -10 336 5T306 36L300 51Q299 52 296 50Q294 48 292 46Q233 -10 172 -10Q117 -10 75 30T33 157ZM351 328Q351 334 346 350T323 385T277 405Q242 405 210 374T160 293Q131 214 119 129Q119 126 119 118T118 106Q118 61 136 44T179 26Q217 26 254 59T298 110Q300 114 325 217T351 328Z"></path><path id="MJX-10928-TEX-N-2208" d="M84 250Q84 372 166 450T360 539Q361 539 377 539T419 540T469 540H568Q583 532 583 520Q583 511 570 501L466 500Q355 499 329 494Q280 482 242 458T183 409T147 354T129 306T124 272V270H568Q583 262 583 250T568 230H124V228Q124 207 134 177T167 112T231 48T328 7Q355 1 466 0H570Q583 -10 583 -20Q583 -32 568 -40H471Q464 -40 446 -40T417 -41Q262 -41 172 45Q84 127 84 250Z"></path><path id="MJX-10928-TEX-D-211D" d="M17 665Q17 672 28 683H221Q415 681 439 677Q461 673 481 667T516 654T544 639T566 623T584 607T597 592T607 578T614 565T618 554L621 548Q626 530 626 497Q626 447 613 419Q578 348 473 326L455 321Q462 310 473 292T517 226T578 141T637 72T686 35Q705 30 705 16Q705 7 693 -1H510Q503 6 404 159L306 310H268V183Q270 67 271 59Q274 42 291 38Q295 37 319 35Q344 35 353 28Q362 17 353 3L346 -1H28Q16 5 16 16Q16 35 55 35Q96 38 101 52Q106 60 106 341T101 632Q95 645 55 648Q17 648 17 665ZM241 35Q238 42 237 45T235 78T233 163T233 337V621L237 635L244 648H133Q136 641 137 638T139 603T141 517T141 341Q141 131 140 89T134 37Q133 36 133 35H241ZM457 496Q457 540 449 570T425 615T400 634T377 643Q374 643 339 648Q300 648 281 635Q271 628 270 610T268 481V346H284Q327 346 375 352Q421 364 439 392T457 496ZM492 537T492 496T488 427T478 389T469 371T464 361Q464 360 465 360Q469 360 497 370Q593 400 593 495Q593 592 477 630L457 637L461 626Q474 611 488 561Q492 537 492 496ZM464 243Q411 317 410 317Q404 317 401 315Q384 315 370 312H346L526 35H619L606 50Q553 109 464 243Z"></path></defs><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="matrix(1 0 0 -1 0 0)"><g data-mml-node="math"><g data-mml-node="mi"><use xlink:href="#MJX-10928-TEX-I-1D44E"></use></g><g data-mml-node="mo" transform="translate(806.8, 0)"><use xlink:href="#MJX-10928-TEX-N-2208"></use></g><g data-mml-node="TeXAtom" data-mjx-texclass="ORD" transform="translate(1751.6, 0)"><g data-mml-node="mi"><use xlink:href="#MJX-10928-TEX-D-211D"></use></g></g></g></g></svg></mjx-container>, für welche die Matrix <mjx-container class="MathJax" jax="SVG"><svg alt="A" style="vertical-align: 0" xmlns="http://www.w3.org/2000/svg" width="1.697ex" height="1.62ex" role="img" focusable="false" viewBox="0 -716 750 716" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><path id="MJX-10929-TEX-I-1D434" d="M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z"></path></defs><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="matrix(1 0 0 -1 0 0)"><g data-mml-node="math"><g data-mml-node="mi"><use xlink:href="#MJX-10929-TEX-I-1D434"></use></g></g></g></svg></mjx-container> positiv definit ist.</p>
<p> </p>
<p><mjx-container class="MathJax" jax="SVG"><svg alt="\begin{align*}
A=\left(\begin{array}{cccc}
1 & 0 & a & 0 \\
0 & 3 & -2 & 1 \\
a & -2 & 2 & 0 \\
0 & 1 & 0 & 7
\end{array}\right)\end{align*}" style="vertical-align: -5.317ex" xmlns="http://www.w3.org/2000/svg" width="23.571ex" height="11.765ex" role="img" focusable="false" viewBox="0 -2850 10418.6 5200" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><path id="MJX-10930-TEX-I-1D434" d="M208 74Q208 50 254 46Q272 46 272 35Q272 34 270 22Q267 8 264 4T251 0Q249 0 239 0T205 1T141 2Q70 2 50 0H42Q35 7 35 11Q37 38 48 46H62Q132 49 164 96Q170 102 345 401T523 704Q530 716 547 716H555H572Q578 707 578 706L606 383Q634 60 636 57Q641 46 701 46Q726 46 726 36Q726 34 723 22Q720 7 718 4T704 0Q701 0 690 0T651 1T578 2Q484 2 455 0H443Q437 6 437 9T439 27Q443 40 445 43L449 46H469Q523 49 533 63L521 213H283L249 155Q208 86 208 74ZM516 260Q516 271 504 416T490 562L463 519Q447 492 400 412L310 260L413 259Q516 259 516 260Z"></path><path id="MJX-10930-TEX-N-3D" d="M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 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328Q351 334 346 350T323 385T277 405Q242 405 210 374T160 293Q131 214 119 129Q119 126 119 118T118 106Q118 61 136 44T179 26Q217 26 254 59T298 110Q300 114 325 217T351 328Z"></path><path id="MJX-10930-TEX-N-33" d="M127 463Q100 463 85 480T69 524Q69 579 117 622T233 665Q268 665 277 664Q351 652 390 611T430 522Q430 470 396 421T302 350L299 348Q299 347 308 345T337 336T375 315Q457 262 457 175Q457 96 395 37T238 -22Q158 -22 100 21T42 130Q42 158 60 175T105 193Q133 193 151 175T169 130Q169 119 166 110T159 94T148 82T136 74T126 70T118 67L114 66Q165 21 238 21Q293 21 321 74Q338 107 338 175V195Q338 290 274 322Q259 328 213 329L171 330L168 332Q166 335 166 348Q166 366 174 366Q202 366 232 371Q266 376 294 413T322 525V533Q322 590 287 612Q265 626 240 626Q208 626 181 615T143 592T132 580H135Q138 579 143 578T153 573T165 566T175 555T183 540T186 520Q186 498 172 481T127 463Z"></path><path id="MJX-10930-TEX-N-2212" d="M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z"></path><path id="MJX-10930-TEX-N-32" 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