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Theorem exists_nhds_half

Modification history

2018-10-15 13:39
analysis/topology/topological_structures.lean
refactor(analysis/topology/topological_structures): use to_additive to derive topological_add_monoid and topological_add_group
Deleted exists_nhds_halfView on Github →
2018-10-15 13:33
analysis/topology/topological_structures.lean
feat(analysis/topology/topological_groups): construct topologies out of a group and a neighbourhood filter at 0
Added exists_nhds_halfView on Github →