Recall the Laplace expansion of the determinant of an n × n {\displaystyle n\times n} matrix A {\displaystyle A} : for any i , j ∈ { 1 , … , n } {\displaystyle i,j\in \{1,\dots ,n\}} ,
where M i j {\displaystyle M_{ij}} is the determinant of the square matrix formed by deleting row i {\displaystyle i} and column j {\displaystyle j} of A {\displaystyle A} .
