proposition: Lemma fneg_ge0 f x : (forall x, 0 <= f x) -> fneg f x = 0.
proof: Proof. by move=> ?; rewrite /fneg min_l ?normr0. Qed.
imports: mathcomp(all_ssreflect all_algebra) mathcomp.classical(boolp) xfinmap ereal reals discrete realseq mathcomp.classical(classical_sets functions mathcomp_extra) topology