can anyone give some hints to prove rank(A+B)<=rankA+rankB ?(adsbygoogle = window.adsbygoogle || []).push({});

i just don't know how to find the rank(A+B) from the column vectors of (A+B) ... or there's another way to prove?

thanks a lot

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# How to prove rank(A+B)<=rankA+rankB ?thanks

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