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I have the feeling that it is, but Im not really sure how to start the proof. I know I have to prove both closure axioms; u,v ∈ W, u+v ∈ W and k∈ℝ and u∈W then ku ∈ W.
Do I just pick a vector arbitrarily say a vector v = (x,y,z) and go from there?
Do I just pick a vector arbitrarily say a vector v = (x,y,z) and go from there?