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Math Help - Show something is a subspace..

  1. #1
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    Show something is a subspace..

    Show that U intersect W is a subspace of U union W is a subspace of U+W. I have no idea where to start!
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  2. #2
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    U\cap W=U\cup W\ ?
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    Quote Originally Posted by cookiesyum View Post
    Show that U intersect W is a subspace of U union W is a subspace of U+W. I have no idea where to start!
    U\cap W is not always a subspace!
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