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Multiplication <strong>par</strong> une constante<br />

Propriété : Si 〈f0, f1, f2, . . .〉 ←→ F (x), alors<br />

Démonstration :<br />

〈cf0, cf1, cf2, . . .〉 ←→ c · F (x).<br />

〈cf0, cf1, cf2, . . .〉 ←→<br />

= c<br />

∞<br />

cfnx n<br />

n=0<br />

∞<br />

fnx n = c · F (x)<br />

n=0<br />

403

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