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Date: Sun, 30 Jun 24 14:56:17 +0000
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From: WM <wolfgang.mueckenheim@tha.de>
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Le 30/06/2024 à 12:29, Jim Burns a écrit :

> |ℕ| = |ℕ∪{Bob]|

That proves cardinality being useless to describe what we are discussing.

> exists f: ℕ∪{Bob} → ℕ : bijection
> Bob ∉ f(ℕ∪{Bob})
> And Bob disappears.

Bob is only exchanged with other terms. Therefore he cannot disappear.

Regardes, WM