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Math Help - Subspaces

  1. #1
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    Exclamation Subspaces

    Hi Everyone! I hope someone can help me because I REALLY need it!! Thanks!
    Two Questions:
    (1) Is the set of all differentiable real-valued functions defined on R a subspace of C(R)? Justify your answer

    (2) Prove that if W is a subspace of a vector space V and w1,w2,...,wn are in W, then a1w1+a2w2+...+anwn in W for any scalars a1,a2,...an
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  2. #2
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    For #1, what does it mean to be a subspace?
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