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Theorem set.subsingleton_of_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.subsingleton_of_preimageView on Github →
2022-08-16 13:24
src/data/set/basic.lean
feat(data/set/basic): Add natural missing lemmas to `set.subsingleton` and slightly refactor (#15886) …
Added set.subsingleton_of_preimageView on Github →