noun
singular matrix
Technical term in linear algebra for a square matrix that does not have an inverse; its determinant is zero.
非正則行列は逆行列を持たない。
A singular matrix does not have an inverse matrix.
この行列式がゼロなら、それは非正則行列です。
If this determinant is zero, it is a singular matrix.
正則行列 (regular matrix) is the opposite: a square matrix that has an inverse and a non-zero determinant.
Compound of 非 (hi, 'non-') + 正則 (seisoku, 'regular') + 行列 (gyōretsu, 'matrix'). The term is a direct translation of the English 'singular matrix' in mathematical contexts.