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Commit 2018-08-14 01:44 638b7fd4

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feat(set_theory/cardinal): finite lower bound on cardinality

Estimated changes

Modified data/fintype.lean

added theorem fintype.card_coe

Modified data/set/finite.lean

added theorem set.finite.exists_finset

Modified set_theory/cardinal.lean

added theorem cardinal.card_le_of_finset