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Commit 2021-04-06 09:41 3a99001a

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feat(category_theory): Type u is well-powered (#6812) A minor test of the well_powered API: we can verify that Type u is well-powered, and show subobject α ≃o set α.

Estimated changes

Modified src/category_theory/concrete_category/basic.lean

modified theorem category_theory.concrete_category.hom_ext

added theorem category_theory.congr_hom

Modified src/category_theory/equivalence.lean

added def category_theory.equivalence.to_order_iso

added theorem category_theory.equivalence.to_order_iso_apply

added theorem category_theory.equivalence.to_order_iso_symm_apply

Modified src/category_theory/isomorphism.lean

added theorem category_theory.iso.to_eq

Modified src/category_theory/skeletal.lean

added def category_theory.equivalence.thin_skeleton_order_iso

Created src/category_theory/subobject/types.lean

added theorem subtype_val_mono

added def types.mono_over_equivalence_set