Let V be a vector space over a field K. (a) (b) # Prove that for all u EV and all c E K, if cu = 0, then either c = 0 or u = 0. Prove that for all u EV and all a, b E K, if u 0 and a ‡ b then au + bu. Prove that for all u, v EV and all c E K, if u # vand c = 0, then cu ‡ cv. The following proof techniques are helpful for this problem: (c) • Proof by Contradiction: To prove statement P, you may assume that P is false, then show that this assumption leads to a contradiction (of already known facts). • You may prove a statement of the form "P or Q" by assuming that P is false and then showing that, under this assumption, Q must be true.

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