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Web skærmformat. - Aarhus Universitet

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V. Matricer – 2. Lineære afbildninger 395<br />

Ved m lineære ligninger med n ubekendte forstås<br />

a11x1 + ... + a1nxn = b1<br />

a21x1 + ... + a2nxn = b2<br />

.<br />

am1x1 + ... + amnxn = bm<br />

På matrix form A = (aij) m × n-matrix, b = (bi) m-søjle, x = (xj) n-søjle<br />

Ax = b<br />

2.19. Ligninger på matrix form ☞ [LA] 5 Lineære ligningssystemer<br />

Definition - fortsat<br />

Matrix form<br />

Ax = b<br />

skrevet ud ⎛<br />

a11 ... a1n<br />

⎜a21<br />

⎜ ... a2n<br />

⎜ .<br />

⎝ .<br />

am1 ... amn<br />

⎞ ⎛<br />

⎟ ⎜<br />

⎟ ⎜<br />

⎟ ⎜<br />

⎠ ⎝<br />

x1<br />

x2<br />

.<br />

xn<br />

⎞<br />

⎛<br />

b1<br />

⎟<br />

⎠ =<br />

⎜b2<br />

⎜ .<br />

⎝ .<br />

2.20. Koefficient matrix ☞ [LA] 5 Lineære ligningssystemer<br />

bm<br />

⎞<br />

⎟<br />

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