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Commit 2021-11-12 17:48 f0a98494

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feat(category_theory/sites/sheaf): Add sheaf conditions in terms of multiforks/multiequalizers. (#10294) Another PR toward sheafification.

Estimated changes

Modified src/category_theory/sites/sheaf.lean

added def category_theory.presheaf.is_limit_of_is_sheaf

added def category_theory.presheaf.is_sheaf.amalgamate

added theorem category_theory.presheaf.is_sheaf.amalgamate_map

added theorem category_theory.presheaf.is_sheaf.hom_ext

added theorem category_theory.presheaf.is_sheaf_iff_multiequalizer

added theorem category_theory.presheaf.is_sheaf_iff_multifork