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(Solved): DEFINITION: Let W1 and W2 be subspaces of a vector space V. The sum of W1 and W2 is giv ...
DEFINITION: Let W1? and W2? be subspaces of a vector space V. The sum of W1? and W2? is given by W1?+W2?={u+v?u?W1? and v?W2?}
4. Let W be a subspace of a (not necessarily finite-dimensional) vector space V. Prove that any basis for W is a subset of a basis for V.