proposition: Lemma cminmax x y z: cardinalp x -> cardinalp y -> cardinalp z -> cmin x (cmax y z) = cmax (cmin x y) (cmin x z).
proof: Proof. apply: (Gminmax cleA cleR cleT cleT_ee). Qed.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat)