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Commit 2018-11-05 17:58 8eac03c6

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feat(algebra/char_p): define the characteristic of a semiring

Estimated changes

Created algebra/char_p.lean

added theorem add_pow_char

added theorem char_p.cast_eq_zero

added theorem char_p.eq

added theorem char_p.exists

added theorem char_p.exists_unique

added def frobenius

added theorem frobenius_add

added theorem frobenius_def

added theorem frobenius_inj

added theorem frobenius_mul

added theorem frobenius_nat_cast

added theorem frobenius_neg

added theorem frobenius_one

added theorem frobenius_sub

added theorem frobenius_zero

added theorem is_monoid_hom.map_frobenius

added theorem ring_char.eq

added theorem ring_char.spec

Modified algebra/group_power.lean

added theorem pow_eq_zero