[Merged by Bors] - Feat: add lemmas about Set.diagonal
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urkud
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This has not yet been merged in mathlib3. What is the policy here? To wait until the mathlib3 PR is merged? |
fpvandoorn
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Needs to be updated after new files have been ported |
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### Sets * Add `set.maps_to_prod_map_diagonal`, `set.diagonal_nonempty`, and `set.diagonal_subset_iff`. ### Filters * Generalize and rename `nhds_eq_comap_uniformity_aux` to `filter.mem_comap_prod_mk`. * Add `set.nonempty.principal_ne_bot` and `filter.comap_id'`. * Rename `filter.has_basis.comp_of_surjective` to `filter.has_basis.comp_surjective`. ### Uniform spaces * Rename `monotone_comp_rel` to `monotone.comp_rel` to enable dot notation. * Add `nhds_eq_comap_uniformity'`. * Use `𝓝ˢ (diagonal γ)` instead of `⨆ x, 𝓝 (x, x)` in `uniform_space_of_compact_t2`. * Golf here and there. ### Mathlib 4 port Relevant parts are forward-ported in leanprover-community/mathlib4#1438
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bors d+ |
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This is a partial forward-port of leanprover-community/mathlib#18111
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Pull request successfully merged into master. Build succeeded: |
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Set.diagonalSet.diagonal
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This is a partial forward-port of leanprover-community/mathlib#18111