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In mathematics, and in particular linear algebra, the pseudoinverse of an matrix is a generalization of the inverse matrix.[1] More precisely, this article talks about the Moore-Penrose pseudoinverse, which was independently described by E. H. Moore[2] in 1920 and Roger Penrose[3] in 1955. Earlier, Fredholm had introduced the concept of a pseudoinverse of integral operators in 1903. The term generalized inverse is sometimes used as a synonym for pseudoinverse.