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Aproximarea functionalelor liniare

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Introducere<br />

Derivare numerică<br />

Integrare numerică<br />

Cuadraturi adaptive<br />

Cuadraturi . . .<br />

Cuadraturi . . .<br />

Formule . . .<br />

Home Page<br />

Title Page<br />

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Page 55 of 58<br />

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Quit<br />

b<br />

a<br />

deci<br />

Dar gradul de exactitate 2n − 1 implică<br />

b<br />

a<br />

w(x)(H2n−1f)(x)dx =<br />

w(x)f(x)dx =<br />

Rn(f) =<br />

n<br />

wif(xi) +<br />

i=1<br />

n<br />

wi(H2n−1f)(xi) =<br />

i=1<br />

b<br />

a<br />

n<br />

wif(xi),<br />

i=1<br />

w(x)u 2 (x)f[x, x1, x1, . . . , xn, xn]dx,<br />

b<br />

w(x)u<br />

a<br />

2 n (x)f[x, x1, x1, . . . , xn, xn]dx.<br />

Cum w(x)u 2 (x) ≥ 0, aplicând teorema de medie pentru integrale<br />

¸si teorema de medie pentru diferent¸e divizate avem

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