fact: Definition Rord n1 n2 (rn : nat_R n1 n2) : 'I_n1 -> ord_instN n2 -> Type := fun x y => x = y :> nat.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq) mathcomp(choice fintype bigop matrix) CoqEAL(hrel param refinements seqmx seqpoly)