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Def. S. 9Eine Menge A heisst endlich, wenn es für ein n ∈ ℕ eine bijektive Abbildung ℕ_(<n) → A gibt, sonst heisst A unendlich. Ist A eine endliche Menge und ℕ_(<n) → A eine bijektive Abbildung, so sagen wir, die Kardinalität von A ist n; in Zeichen: |A| = n.
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