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feat(SetTheory/Cardinal/Finite): prove lemmas about PartENat.card (#5307
) Prove lemmas to handle PartENat.card Inspired from the similar lemmas for Nat.card This is a mathlib4 companion to the PR #19198 of mathlib3 Co-authored-by: Antoine Chambert-Loir <antoine.chambert-loir@math.univ-paris-diderot.fr>
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