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Web skærmformat. - Aarhus Universitet

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I. Differentiation – 4. Kædereglen 80<br />

er Jakobimatricen følgende m × n-matrix<br />

⎛<br />

du(g) =<br />

⎜<br />

⎝<br />

∂g1<br />

∂u1<br />

.<br />

∂gm<br />

∂u1<br />

4.19. Kædereglen ☞ [LA] $ 2.2 Kædereglen i matrix-formulering<br />

Sætning<br />

For differentiable afbildninger<br />

er sammensætningen<br />

R n<br />

...<br />

. ..<br />

...<br />

∂g1<br />

∂un<br />

.<br />

∂gm<br />

∂un<br />

⎞<br />

⎟<br />

⎠<br />

g<br />

−−−−→ Rm f<br />

−−−−→ Rp R n f◦g<br />

−−−−→ R p<br />

differentiabel og Jakobimatricen er matrixproduktet<br />

du(f ◦ g) = d g(u)(f)du(g)<br />

4.20. Matricer er godt ☞ [S] 11.5 The chain rule<br />

Eksempel 5 (Matrixform)<br />

u = x 4 y + y 2 z 3<br />

x = rse t , y = rs 2 e −t , z = r 2 ssin t

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