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Line 93: :“Square” is generally required, square matrices being generally more interesting. For non-square matrices one generally calls these “trapezoidal” matrices, which is mentioned in the article. :—Nils von Barth ([[User:Nbarth\|nbarth]]) ([[User talk:Nbarth\|talk]]) 08:24, 2 December 2009 (UTC) ::My textbook (Spence, Insel, and Friedberg. "Elementary Linear Algebra: A Matrix Approach", 2nd edition) in chapter 2.6 "The LU Decomposition of a Matrix" gives a 3x4 matrix as an example of an upper triangular matrix. Is it common to refer to non-square "trapezoidal" matrices as "triangular" in the context of LU Decompositions or is this something that is otherwise rare other than this book? ::[[User:Derek M\|Derek M]] ([[User talk:Derek M\|talk]]) 08:53, 17 March 2018 (UTC) == Forward and Back Substitution ==

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