Concept

Determinant

Summary
In mathematics, the determinant is a scalar value that is a function of the entries of a square matrix. It characterizes some properties of the matrix and the linear map represented by the matrix. In particular, the determinant is nonzero if and only if the matrix is invertible and the linear map represented by the matrix is an isomorphism. The determinant of a product of matrices is the product of their determinants (the preceding property is a corollary of this one). The determinant of a matrix A is denoted det(A), det A, or . The determinant of a 2 × 2 matrix is :\begin{vmatrix} a & b\c & d \end{vmatrix}=ad-bc, and the determinant of a 3 × 3 matrix is : \begin{vmatrix} a & b & c \ d & e & f \ g & h & i \end{vmatrix}= aei + bfg + cdh - ceg - bdi - afh. The determinant of an n × n matrix can be defined in several equivalent ways. The Leibniz formula expresses the determinant as a sum of signed products of matrix entries such that each summand is the pr
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