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Re:Why is it important for a matrix to be square? (2018) by yt-sdb on Sunday June 21, 2020 @03:50PM (#23594821)
Not an application, but this my favorite explanation of SVD:

http://gregorygundersen.com/blog/2018/12/10/svd/

It's such an important operation that I'd say understanding it changes how you understand a lot of linear algebra. That Kun post is also good.

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