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Determinant

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The determinant of a square matrix is a scalar (commonly computed using so-called expansion by minors) which is nonzero if and only if the matrix has an inverse.

Determinant is a high school-level concept that would be first encountered in a pre-calculus course. It is listed in the California State Standards for Linear Algebra.

Prerequisites

Matrix: A matrix is a concise and useful way of uniquely representing and working with linear transformations. In particular, for every linear transformation, there exists exactly one corresponding matrix, and every matrix corresponds to a unique linear transformation. The matrix is an extremely important concept in linear algebra.
Vector Space: A vector space is a set that is closed under finite vector addition and scalar multiplication. The basic example is n-dimensional Euclidean space.

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