(1)Prove that a nonempty set(adsbygoogle = window.adsbygoogle || []).push({}); Wis a subspce of a vector spaceViff ax+byis an element ofWfor all scalars a and b and all vectorsxandyin W

(2)Give an example showing that the union of two subspaces of a vector space V is not necessarily a subspaces of V

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# How to prove it

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