Mathlib v3 is deprecated. Go to Mathlib v4

Theorem topological_space.is_topological_basis.sum

Modification history

2022-02-22 15:16
src/topology/bases.lean
feat(topology/bases): disjoint unions of second-countable spaces are second-countable (#12061)
Added topological_space.is_topological_basis.sumView on Github →