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Commit 2021-04-20 07:56 a4f59bde

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feat(category_theory/subobject): easy facts about the top subobject (#7267)

Estimated changes

Modified src/category_theory/subobject/lattice.lean

added theorem category_theory.subobject.eq_top_of_is_iso_arrow

added theorem category_theory.subobject.is_iso_arrow_iff_eq_top

added theorem category_theory.subobject.is_iso_iff_mk_eq_top

modified theorem category_theory.subobject.map_top

added theorem category_theory.subobject.mk_eq_top_of_is_iso

modified theorem category_theory.subobject.top_eq_id