I can't find out how to prove this question. Can anyone help?(adsbygoogle = window.adsbygoogle || []).push({});

Let A be an n x m matrix of rank m, n>m. Prove that (A^t)A has the same rank m as A.

Where A^t = the transpose of A.

I seen someone else have asked the question before and had got the answer. However I can't understand it. Hope someone can give me a more detail suggestion. Thanks!

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# Homework Help: Prove help. rank of inverse matrix

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