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Regarding Theorem 12 in §1.9, I thought that if the columns of A span Rm, then those columns must be linearly independent. Are “onto” and “one-to-one” actually the same thing?

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Regarding Theorem 12 in §1.9, I thought that if the columns of A span Rm, then those columns must be linearly independent. Are “onto” and “one-to-one” actually the same thing?

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If the columns of A span Rm, they need not be linearly independent.

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