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Theorem set.nonempty.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.nonempty.preimageView on Github →
2021-03-14 03:22
src/data/set/basic.lean
feat(data/real/ennreal,topology/*): assorted lemmas (#6663) …
Added set.nonempty.preimageView on Github →