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Web skærmformat. - Aarhus Universitet

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I. Differentiation – 6. Maksimum/minimum 126<br />

6.23. 2. ordens kriterium ☞ [LA] 13.2 2.ordens partielle afledede, . . .<br />

Andenordenstest - Eksempel<br />

Funktionen f(x,y,z) = 2x 2 + 3y 2 − z 2 har gradient<br />

∇(f) = (4x,6y, −2z)<br />

og kritisk punkt P = (0,0,0).<br />

Hesse matricen<br />

⎛<br />

4 0<br />

⎞<br />

0<br />

HP(f) = ⎝0<br />

6 0 ⎠<br />

har egenværdier 4,6 > 0 of −2 < 0.<br />

0 0 −2<br />

Andenordenstesten giver:<br />

P er et saddelpunkt.<br />

6.24. Lokalt maksimum/minimum ☞ [S] 11.7 Maximum and minimum values<br />

To variabele - figur

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