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Commit 2019-03-21 23:44 798a08d4

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feat(group_theory/submonoid): add closure_singleton (#810)

feat(group_theory/submonoid): add closure_singleton
adding some to_additive

Estimated changes

Modified src/group_theory/submonoid.lean

added theorem add_monoid.closure_singleton

added theorem monoid.closure_singleton

added theorem multiples.self_mem

added theorem multiples.zero_mem

added theorem powers.one_mem

added theorem powers.self_mem