Mathlib v3 is deprecated. Go to Mathlib v4

Theorem set.preimage_eq_preimage'

Modification history

2022-12-07 20:30
src/data/set/basic.lean
refactor(data/set/basic): move image, preimage, and range to a new file (#17842) …
Modified set.preimage_eq_preimage'View on Github →
2019-04-20 20:07
src/data/set/basic.lean
feat(data/[fin]set): add some more basic properties of (finite) sets (#948) …
Added set.preimage_eq_preimage'View on Github →