Mathlib v3 is deprecated. Go to Mathlib v4

Theorem topological_space.is_topological_basis.exists_subset_of_mem_open

Modification history

2021-04-01 01:24
src/topology/bases.lean
refactor(topology/bases): use `structure` for `is_topological_basis (#6947) …
Added topological_space.is_topological_basis.exists_subset_of_mem_openView on Github →