fact: Definition cast_cols {rows} {f : nat -> nat -> nat} {P : nat -> nat -> Type} (HPf : forall k n, P k n -> f k n = n) {k n} (HP : P k n) : 'M[R]_(rows, f k n) -> 'M_(rows, n) := castmx (erefl rows, HPf _ _ HP).
imports: mathcomp(all_ssreflect ssralg poly polydiv fingroup perm) mathcomp(finalg zmodp matrix mxalgebra mxpoly vector) ssr_ext ssralg_ext poly_ext f2 hamming decoding channel_code