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Theorem is_open_neg

Modification history

2021-05-19 12:41
src/topology/basic.lean
refactor(topology/basic): use dot notation in `is_open.union` and friends (#7647) …
Deleted is_open_negView on Github →
2017-09-07 20:38
topology/topological_space.lean
feat(topology/topological_structures,ennreal): show continuity of of_ennreal and of_real
Added is_open_negView on Github →