Cofactor
= Cofactor
{title2=$C_{ij}=(-1)^{i+j}\det A^{(ij)}$}
The <cofactor> of a <matrix> entry is the signed <determinant> of the minor obtained by deleting its row and column. These scalars form the <cofactor matrix>, and their transpose forms the <adjugate matrix>. They give row and column expansions of the <determinant>, including for singular <matrices>.