Rayon de convergence d'une suite complexe Flashcards

1
Q

Si rRa alors …

A

La suite (anr**n) est bornée

La suite (anr**n) nest pas bornée

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2
Q

Si La suite (anr**n) est bornée alors …

La suite (anr**n) n’est pas bornée alors …

A

r

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3
Q

Le rayon de convergence de |an| est …

A

Le rayon de convergence de (an)

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4
Q

Soit a appartenant a C* , le rc de (lambda an) est …

A

Rayon de convergence de an

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5
Q

Quesque le rayon de convergence dune suite complexe

A

Cest la borne sup de {r appartenant à R+ / (anr**n) soit borné}

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6
Q

Sil existe N tel que pour tout n>= N, que dire des rayons de convergence si :
|an|

A

Ra >= Rb

Ra>= Rb

Ra = Rb

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7
Q

Que dire de R(a+b) ?

A

R(a+b)>=min(Ra,Rb) et si Ra != Rb alors on a egalite

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8
Q

Si [0,R[ inclue dans {r appartenant à R+ / (an r**n) soit borné} alors …

A

R

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9
Q

Rayon de convergence de D(a)= (n+1) a(n+1)

A

Ra

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10
Q

Rayon de convergence de I(a) = an-1/n

A

Ra

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11
Q

Le rayon de convergence est l’unique élément de [0,+infini] qui vérifie quoi ?

A

Pour tout complexe z, |z| >Ra, la serie de terme ge anz**n est grossièrement divergente
|z|

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12
Q

Si la serie de terme ge anz0**n cv alors ..

Et si dv …

A

|z0|=Ra

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13
Q

Si c est le produit de convolution des 2 suites a et b alors …

A

Rc>=min(Ra,Rb)

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