Minor (linear algebra)
Determinant of a subsection of a square matrix / From Wikipedia, the free encyclopedia
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This article is about a concept in linear algebra. For the concept of "minor" in graph theory, see Graph minor.
In linear algebra, a minor of a matrix A is the determinant of some smaller square matrix, cut down from A by removing one or more of its rows and columns. Minors obtained by removing just one row and one column from square matrices (first minors) are required for calculating matrix cofactors, which in turn are useful for computing both the determinant and inverse of square matrices. The requirement that the square matrix be smaller than the original matrix is often omitted in the definition.