[Merged by Bors] - feat(topology): add a few lemmas #9885
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Add `is_topological_basis.is_open_map_iff`,
`is_topological_basis.exists_nonempty_subset`, and
`interior_{s,b,}Inter_subset`.
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Add `is_topological_basis.is_open_map_iff`,
`is_topological_basis.exists_nonempty_subset`, and
`interior_{s,b,}Inter_subset`.
Motivated by lemmas from `flypitch`.
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Oct 23, 2021
Add `is_topological_basis.is_open_map_iff`,
`is_topological_basis.exists_nonempty_subset`, and
`interior_{s,b,}Inter_subset`.
Motivated by lemmas from `flypitch`.
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Nov 9, 2021
Add `is_topological_basis.is_open_map_iff`,
`is_topological_basis.exists_nonempty_subset`, and
`interior_{s,b,}Inter_subset`.
Motivated by lemmas from `flypitch`.
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Add
is_topological_basis.is_open_map_iff,is_topological_basis.exists_nonempty_subset, andinterior_{s,b,}Inter_subset.Motivated by lemmas from
flypitch.