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Question: Let D be a nonempty subset of a vector space V over a field F. Let B be a finite linearly independet subset of span D having n elements. Prove there exists a subset D' of D also having n elements such that

span[(D-D') U B] = span(D).

Moreover, if D is linearly independent, so is (D-D') U B.

Can anyone help?

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# Spanning sets

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