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There are several algorithms to compute a matrix inverse, and each algorithm has several variations. Three common algorithms are LUP ("lower upper permutation"), SVD ("singular value decomposition") ...
Kunio Tanabe, Masahiko Sagae, An Exact Cholesky Decomposition and the Generalized Inverse of the Variance-Covariance Matrix of the Multinomial Distribution, with Applications, Journal of the Royal ...
Timo Mäkeläinen, George P. H. Styan, A Decomposition of an Idempotent Matrix Where Nonnegativity Implies Idempotence and None of the Matrices Need Be Symmetric, Sankhyā: The Indian Journal of ...
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