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Theorem separated.preimage

Modification history

2022-09-27 17:24
src/topology/separation.lean
chore(topology/separation): rename `separated` to `separated_nhds` (#16604) …
Deleted separated.preimageView on Github →
2022-03-18 21:54
src/topology/separation.lean
feat(topology/{order,separation}): several lemmas from an old branch (#12794) …
Added separated.preimageView on Github →