This exercise makes the notation of writing '+' between sets more natural. Prove that, where W1, .
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and so the sum of subspaces is the subspace of all sums.
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W, +..+Wi = {w +w2 + .+ Wk |Wi E W1,..., W E Wr),
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Set inclusion one way is easy is a subset of W 1 W k because each is a sum of vec...View the full answer
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