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Web skærmformat. - Aarhus Universitet

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II. Integration – 1. Dobbelt integral 165<br />

y<br />

a b<br />

Integralet er arealet<br />

1.4. Riemann summen ☞ [S] 5.2 The definite integral<br />

Bemærkning<br />

n<br />

i=1<br />

kaldes Riemann summen og tilnærmer integralet<br />

b<br />

f(x)dx ≈<br />

a<br />

f(x ∗ i )∆x<br />

n<br />

i=1<br />

f(x ∗ i )∆x<br />

Hvis f(x) ≥ 0 så tilnærmer Riemann summen arealet under grafen. Det bestemte integral er da<br />

x

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