Theorem Sym2.ncard_mk_fiber_eq_card_toFinset

Modification history

2026-10-01 17:54
Mathlib/Data/Sym/Sym2/Card.lean
feat(Data/Sym/Sym2/Card): cardinality theorems about `Sym2 α` (#36442)
Added Sym2.ncard_mk_fiber_eq_card_toFinsetView on Github →