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Inverse of a Matrix |
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Inverse of a Matrix
For a given square matrix A = ǀǀaijǀǀn1 of order n there exists a matrix B = ǀǀbijǀǀn1 of the same order (called inverse matrix) such that AB = E, where E is the unit matrix; then the equation BA = E also holds. The inverse of a matrix A is designated as A–1. For the existence of the inverse of a matrix A–1, it is necessary and sufficient that the determinant of the given matrix A be nonzero; that is, the matrix A must be nonsingular. The elements bij of the inverse of a matrix are found by the formula bij = Aji/D, where Aji is the cofactor of the element aij of matrix A and D is the determinant of matrix A. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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