proposition: Lemma geC0_unit_exp x n : 0 <= x -> (x ^+ n.+1 == 1) = (x == 1).
proof: Proof. by move=> x_ge0; rewrite pexpr_eq1. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)