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Commit 2020-10-31 17:41 be161d11

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feat(category_theory/sites): functor inclusion constructions (#4845)

Estimated changes

Modified src/category_theory/sites/sieves.lean

added def category_theory.sieve.sieve_of_subfunctor

added theorem category_theory.sieve.sieve_of_subfunctor_apply

added theorem category_theory.sieve.sieve_of_subfunctor_functor_inclusion