Commit 2022-02-10 10:46 da164c6b

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feat (category_theory/karoubi_karoubi) : idempotence of karoubi (#11931) In this file, we construct the equivalence of categories karoubi_karoubi.equivalence C : karoubi C ≌ karoubi (karoubi C) for any category C.

Estimated changes

Created src/category_theory/idempotents/karoubi_karoubi.lean

added def category_theory.idempotents.karoubi_karoubi.counit_iso

added def category_theory.idempotents.karoubi_karoubi.equivalence

added def category_theory.idempotents.karoubi_karoubi.inverse

added def category_theory.idempotents.karoubi_karoubi.unit_iso