I would like to know the statement is always true or sometimes false, and what is the reason:(adsbygoogle = window.adsbygoogle || []).push({});

A is a square matrix

P/S: I denote transpose A as A^T

1)If AA^T is singular, then so is A;

2)If A^2 is symmetric, then so is A.

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# About Singular and Symmetric Matrix

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