15A21 6 canonical diagonal form 5 15A23 2 15A33 2 collection of matrices 2 common divisors 2 elementary divisor ring 2 generalized equivalence 2 invariants 2 primitive matrices 2 Bezout B−domain 1 Hermite normal form 1 adequate ring 1 canonical diagonal form of polynomial matrices 1 divisor of matrices 1 factorization of matrices up to associate 1 monic divisors of polynomial matrices 1 one-side equivalence of matrices 1 transformable matrices 1