fact: Record almost_field_theory : Prop := mk_afield { AF_AR : almost_ring_theory rO rI radd rmul rsub ropp req; AF_1_neq_0 : ~ 1 == 0; AFdiv_def : forall p q, p / q == p * / q; AFinv_l : forall p, ~ p == 0 -> / p * p == 1 }.
imports: ZArith_base