Liste des Groupes | Revenir à s math |
|ℕ| = |ℕ∪{Bob]|That proves cardinality being useless to describe what we are discussing.
exists f: ℕ∪{Bob} → ℕ : bijectionBob is only exchanged with other terms. Therefore he cannot disappear.
Bob ∉ f(ℕ∪{Bob})
And Bob disappears.
Les messages affichés proviennent d'usenet.