Rappels sur les cardinaux finis Flashcards

1
Q

|A⋃B| + |A⋂B| = …

A

|A| + |B|

Pour s’en convaincre : |A⋃B| = |A| + |B| - |A⋂B|

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2
Q

|A\B| + |A⋂B| = …

A

|A|

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3
Q

|cA| = …

A

|E| - |A|

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4
Q

Que signifie la notation Ek ?

A

Ek = E × E × … × E (k fois)

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5
Q

|Ek| = …

A

|E|k

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6
Q

Que signifie la notation FE ?

A

Elle désigne l’ensemble de toutes les applications de E vers F

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7
Q

Comment note-t-on l’ensemble de toutes les applications de E vers F ?

A

FE

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8
Q

|FE| = …

A

|F||E|

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9
Q

|𝒫(E)| = …

A

2|E|

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10
Q

Si A ⊂ E, quelle est l’application caractéristique de A dans E ?

A

χA : E → {0, 1}
        x ↦ {1 si x ∈ A
            {0 si x ∉ A

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11
Q

À quoi sert une application caractéristique de A dans E ? (où A ⊂ E)

A

À expliciter l’appartenance ou non à un sous ensemble de A pour tout élément de E.

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12
Q

Si A ⊂ E, quelle est la bijection χ ?

A

χ : 𝒫(E) → {0, 1}E
   A ↦ χA

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