A criterion for the universality of a matrix from the group U T n (R) over a commutative and associative ring R with unity, Sib.Èlektron. Mat. Izv., 2019, Volume 16, 165-174 Use of the all-Russian mathematical portal Math-Net.Ru implies that you have read and agreed to these terms of useAbstract. We find necessary and sufficient universality conditions of a matrix from the unitriangular matrix group of arbitrary finite dimension over a commutative associative ring with unity. An algorithm is used to determine the universality of the element of the unitriangular matrix group over the ring of polynomials with a finite number of variables with integer coefficients.