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Commit 2019-02-09 15:38 484d8648

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add geometric sum (#701)

feat(data/finset): add range_add_one
feat(algebra/big_operators): geometric sum for semiring, ring and division ring

Estimated changes

Modified src/algebra/big_operators.lean

added theorem geom_sum

added theorem geom_sum_mul

added theorem geom_sum_mul_add

Modified src/data/finset.lean

added theorem finset.range_add_one