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Theorem is_open_map_iff_nhds_sets

Modification history

2018-10-15 13:39
analysis/topology/quotient_topological_structures.lean
refactor(analysis/topology/topological_structures): use to_additive to derive topological_add_monoid and topological_add_group
Deleted is_open_map_iff_nhds_setsView on Github →
2018-10-15 13:39
analysis/topology/quotient_topological_structures.lean
feat(analysis/topology/quotient_topological_structures): endow quotient …
Added is_open_map_iff_nhds_setsView on Github →