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Commit 2020-06-02 19:58 607286ee

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feat(data/*): ring_hom.ext_{nat,int,rat,zmod} (#2918)

Estimated changes

Modified src/data/int/basic.lean

added theorem ring_hom.ext_int

Modified src/data/nat/cast.lean

added theorem ring_hom.ext_nat

Modified src/data/rat/cast.lean

added theorem ring_hom.ext_rat

Modified src/data/zmod/basic.lean

added theorem ring_hom.ext_zmod