Mathlib v3 is deprecated. Go to Mathlib v4

Theorem finset.union_congr_left

Modification history

2022-07-17 23:41
src/data/finset/basic.lean
feat(order/lattice): Congruence lemmas for `⊔` and `⊓` (#15439) …
Added finset.union_congr_leftView on Github →