In this theorem it states " Let A be a m x n matrix. That is For each vector(adsbygoogle = window.adsbygoogle || []).push({}); bin R^m, the column Ax=bhas a solution..." Why do they say thatbεR^m? Is that becausebis a mx1 column matrix where it has m rows making it belong to R^m?

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# R^n and R^m

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