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Commit 2018-10-17 13:50 ef9566d3

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feat(data/equiv): equivalences for fin * fin and fin + fin

Estimated changes

Modified data/equiv/basic.lean

deleted theorem equiv.apply_eq_iff_eq_inverse_apply

added theorem equiv.eq_symm_apply

modified theorem equiv.ext

added theorem equiv.perm.ext

added theorem equiv.symm_apply_eq

Created data/equiv/fin.lean

added def fin_prod_fin_equiv

added def sum_fin_sum_equiv