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I am trying to find a reference for the following results :

Let A and B be two matrices :

Ker A \subset Ker B if and only if there exists M such that B= MA

I already have a proof for this statement, but it looks like a classical algebraic result, so I'm looking for a reference to add in my paper, like a book or a paper..

Thanks in advance for any suggestions..

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# Ker A \subset Ker B

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