noun
In linear algebra, the signed minor of a matrix element, used in determinant expansion and adjugate matrices.
行列式を計算するとき、余因子展開を使うと便利だ。
When computing a determinant, it is convenient to use cofactor expansion.
Minor determinant; the cofactor is the signed minor.
Compound of 余 (yo, 'remaining' or 'extra') and 因子 (inshi, 'factor'), a calque from English 'cofactor' in linear algebra.