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Commit 2021-08-16 16:19 f8241b74

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feat(algebra/big_operators/basic): prod_subsingleton (#8423)

Estimated changes

Modified src/algebra/big_operators/basic.lean

added theorem finset.prod_unique_nonempty

added theorem fintype.prod_subsingleton

added theorem fintype.prod_unique

Modified src/algebra/group/units.lean

added theorem unique_has_one

Modified src/data/fintype/card.lean

deleted theorem fintype.prod_unique