13F99 elementary divisor ring 8 Bezout ring 7 neat ring 7 clear ring 4 neat range one 4 stable range one 4 clean ring 3 Bezout duo-domain 2 Distributive domain 2 diagonal reduction of matrices 2 duo ring 2 effective ring 2 elementary reduction of matrices 2 exchange ring 2 idempotent of stable range 1 2 ring with elementary reduction of matrices 2 rings of almost stable range 1 2 semiexchange ring 2 stable range 2 stable range 1 2 06F20 1 Bezout domain 1 Hermite ring 1 PM-ring 1 clean element 1 neat element 1 neat range 1 1 regular ring 1 semihereditary ring 1