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Commit 2019-01-10 09:46 8b66ebde

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functions and cardinality (#556)

Estimated changes

Modified data/set/countable.lean

added theorem set.countable_of_injective_of_countable_image

Modified data/set/finite.lean

added theorem set.finite_subsets_of_finite

Modified data/set/function.lean

added theorem set.inv_fun_on_image

added theorem set.maps_to'

added theorem set.maps_to_image

added theorem set.maps_to_range