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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$\displaystyle U\cap W=U\cup W\ ?$
Originally Posted by cookiesyum 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! $\displaystyle U\cap W$ is not always a subspace!
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