'Unit triangular matrix predicate.
A unit triangular matrix is a triangular matrix with 1s
on the diagonal.
Examples
>>> from sympy import Q, ask, MatrixSymbol
>>> X = MatrixSymbol(\'X\', 4, 4)
>>> ask(Q.triangular(X), Q.unit_triangular(X))
True'

@predicate_memo
def unit_triangular(self):

    return Predicate('unit_triangular')
