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Topologia Flashcards

(20 cards)

1
Q

disco aberto

A

D(z0,r) = { z∈ℂ : |z-z0| < r }

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2
Q

disco fechado

A

D[z0,r] = { z∈ℂ : |z-z0| ≤ r }

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3
Q

ponto interior z∈X

A

∃ r > 0 : D(z, r) ⊆ X

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4
Q

interior

A

Ẋ ⊆ X
A ⊆ X -> Å ⊆ Ẋ

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5
Q

aberto

A

X = Ẋ

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6
Q

fechado

A

C\F aberto

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7
Q

ponto de aderência

A

∀ r > 0, D(z,r) ∩ X ≠ ∅

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8
Q

aderência

A


X ⊆ X̅
A ⊆ X -> Á ⊆ X̅

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9
Q

C(X̅)

A

(CXº)

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10
Q

fronteira

A

dX = X̅ ∩ (CX)– (com risco por cima)

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11
Q

ponto fronteira

A

∀ r > 0, D(z,r) ∩ X ≠ ∅ e D(z,r) ∩ CX ≠ ∅

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12
Q

X̅ =

A

Xº U fr(X)

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13
Q

X fechado

A

fr(X) ⊆ X

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14
Q

X aberto

A

fr(X) ∩ X = ∅

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15
Q

ponto de acumulação

A

∀ r > 0, D(z,r) \ {z} ∩ X ≠ ∅4

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16
Q

pontos singulares

A

derivada não está definida ou é infinito

17
Q

X conexo

A

Não existe uma cisão

18
Q

Cisão

A

U,V abertos disjuntos
X ⊆ U ∪ V
X ∩ U ≠ ∅ e X ∩ V ≠ ∅

19
Q

caminho simples

A

“não se cruza”

20
Q

caminho regular por partes

A

contínuo, derivável por partes, derivada não nula onde exite