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Taylorpolynomier Funktion af flere variable

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De…nition <strong>af</strong> Taylorpolynomium<br />

I Givet en funktion f og et udviklingspunkt x 0 . Find et<br />

polynomium P n <strong>af</strong> grad højst n, så f og P n har samme<br />

nulte, første, anden, tredie, . . . , n’te a‡edede i punktet<br />

x 0 .<br />

I P n skal så opfylde ligningerne<br />

I Skriver vi P n på formen<br />

P n (x 0 ) = f (x 0 )<br />

Pn 0 (x 0 ) = f 0 (x 0 )<br />

Pn 00 (x 0 ) = f 00 (x 0 )<br />

.<br />

P n (n) (x 0 ) = f (n) (x 0 )<br />

P n (x) = a 0 + a 1 (x x 0 ) + a 2 (x x 0 ) 2 + a 3 (x x 0 ) 3<br />

+a 4 (x x 0 ) 4 + . . . + a n (x x 0 ) n<br />

søger vi nu a 0 , a 1 , a 2 , . . . , a n .<br />

<strong>Taylorpolynomier</strong>.<br />

<strong>Funktion</strong> <strong>af</strong> ‡ere<br />

<strong>variable</strong><br />

Preben Alsholm<br />

<strong>Taylorpolynomier</strong><br />

De…nition <strong>af</strong><br />

Taylorpolynomium<br />

Udledning <strong>af</strong> formlen<br />

for Taylorpolynomiet<br />

Formlen for<br />

Taylorpolynomiet<br />

Eksempel 4.8.2 i<br />

Adams<br />

<strong>Funktion</strong> givet ved<br />

simpel forskrift<br />

<strong>Funktion</strong> givet ved<br />

di¤erentialligning<br />

Taylors formel med<br />

Lagrange’s restled<br />

Vurdering <strong>af</strong> fejlen<br />

ved Taylors formel I<br />

Vurdering <strong>af</strong> fejlen<br />

ved Taylors formel II<br />

Store O-notationen<br />

<strong>Funktion</strong> <strong>af</strong> ‡ere<br />

<strong>variable</strong>

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