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Web skærmformat. - Aarhus Universitet

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II. Integration – 1. Dobbelt integral 170<br />

1.11. Inddelinger i to retninger ☞ [S] 12.1 Double integrals over rectangles<br />

Figur<br />

y<br />

d<br />

c<br />

a b<br />

x<br />

(x ij , y ij )<br />

Inddelt rektangel R = [a,b] × [c,d]<br />

1.12. Gør det let<br />

Bemærkninger<br />

☞ [S] 12.1 Double integrals over rectangles<br />

Med valg af brikhjørner som middelpunkter kan det bestemte integral af en funktion f : R → R<br />

skrives simplere<br />

6<br />

<br />

f(x,y)dA = lim<br />

m n<br />

f(xi,yj)∆A<br />

R<br />

m,n→∞<br />

i=1 j=1

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