Séries Flashcards

1
Q

télescopique

A

(A - B) + (B - C) + (C - D) + (D - E) + …

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2
Q

convergence d’une série télescopique

A

lim Sn = L CONVERGE
n-> ∞

lim Sn = ∞ ou ∌ DIVERGE
n-> ∞

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3
Q

géométrique

A

k seulement dans l’exposant ; k doit être linéaire

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4
Q

convergence série géométrique

A

|r| < 1 -> CONVERGE vers a/1 - r

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5
Q

série p

A

1/K^p le K n’est pas à l’exposant

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6
Q

convergence série p

A

p > 1 CONVERGE

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7
Q

convergence quotient de polynômes

A

deg dénumerateur - deg numérateur > 1 CONVERGE

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8
Q

sous quelle forme doit on mettre la série pour utiliser le critère de d’Alembert ?

A

Ak+1 / Ak

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9
Q

Convergence critère de d’Alembert

A

lim Ak+1 / Ak <1 CONVERGE
k-> ∞

lim Ak+1 / Ak = 1 NON CONCLUANT
k-> ∞

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10
Q

Critère de comparaison

A

Ak ≤ Bk

ln(k) ≤ k
-1 ≤ cos(k) ≤ 1
-1 ≤ sin(k) ≤ 1

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11
Q

Convergence critère de comparaison

A

Ak converge si Bk converge

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12
Q

Critère de Cauchy

A

racine kième de Ak

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13
Q

Convergence critère de Cauchy

A

lim Ak <1 CONVERGE
k-> ∞

lim Ak = 1 NON CONCLUANT
k-> ∞

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14
Q

Propriétés des séries (2)

A

Σ c Ak = c Σ Ak

Σ Ak + Bk = Σ Ak + Σ Bk

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