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Theorem set.preimage_singleton_eq_empty

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_singleton_eq_emptyView on Github →
2020-06-25 13:06
src/data/set/basic.lean
chore(*): assorted lemmas about `set` and `finset` (#3158)
Added set.preimage_singleton_eq_emptyView on Github →