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Addition<br />

Propriété : Si<br />

〈f0, f1, f2, . . .〉 ←→ F (x) et 〈g0, g1, g2, . . .〉 ←→ G(x),<br />

alors 〈f0 + g0, f1 + g1, f2 + g2, . . .〉 ←→ F (x) + G(x).<br />

Démonstration :<br />

〈f0 + g0, f1 + g1, f2 + g2, . . .〉 ←→<br />

=<br />

∞<br />

(fn + gn)x n<br />

n=0<br />

<br />

∞<br />

fnx n<br />

<br />

∞<br />

+ gnx n<br />

<br />

n=0<br />

= F (x) + G(x)<br />

n=0<br />

404

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