matrix 8 15A21 7 15B33 6 20M18 6 05C50 5 20M30 5 exponent matrix 5 13C14 4 14H20 4 15A30 4 16P40 4 Rees matrix semigroup 4 commutative ring 4 matrix factorizations 4 semigroup 4 similarity 4 УДК 539.3 4 05C05 3 15A63 3 16G 3 16H99 3 54A10 3 54D35 3 68W30 3 Bohr compactification 3 Coxeter polynomial 3 Gorenstein matrix 3 Gorenstein tiled order 3 adjacency matrix 3 linear matrix inequalities 3