Why is it important for a matrix to be square? (2018)

Re:Why is it important for a matrix to be square? (2018) by solinent on Sunday June 21, 2020 @07:07PM (#23596072)

Good point, while I don't need this clarification others might. I shouldn't have implied that they are the same for square matrices implicitly, hence my failed attempt at using "similar".

However, they're still an extension in the sense that singular values do correspond to (square of the) eigenvalues of the square matrix A A^T and A^T A.

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Re:Why is it important for a matrix to be square? (2018) by blt on Sunday June 21, 2020 @07:35PM (#23596202)

Yeah I guess "extension" is not a precisely defined word. I wanted to make sure other readers didn't interpret like "generalization", meaning that the original narrow concept is precisely a special case of the extension.

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Re:Why is it important for a matrix to be square? (2018) by solinent on Sunday June 21, 2020 @09:24PM (#23596686)

Yeah, I wouldn't have used extension for a math audience, probably just "related concept", or "application of". In the software context it usually means the opposite--something specific that makes use of some existing functionality.

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