fact: Definition ctmat1 : 'M[int]__ := \matrix_(i < 3, j < 3) (nth [::] [:: [:: 1 ; 1 ; 1 ] ; [:: -1 ; 1 ; 1 ] ; [:: 0 ; 0 ; 1 ] ] i)`_j.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq path ssralg) mathcomp(fintype perm choice matrix bigop zmodp poly polydiv mxpoly) CoqEAL(minor hrel param refinements seqmx) mathcomp(ssrint) CoqEAL(binnat binint seqpoly poly_div binord trivial_seq)