Question: 3. Problem 3. What is U + U equal to if U denotes a subspace of a vector space V? 4. Problem 4. Give

3. Problem 3. What is U + U equal to if U

3. Problem 3. What is U + U equal to if U denotes a subspace of a vector space V? 4. Problem 4. Give a counterexample: If U, U2, W are subspaces of U such that U + W = U + W, then U = U.

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