1. The problem statement, all variables and given/known data True/false: Union of two vector subspaces is a subspace. 2. Relevant equations none 3. The attempt at a solution I'm unsure if this is true because I'm also unsure if it already assumes that it is closed under scalar multiplication and addition. If it is closed, then I'd like to think it is true, but it might be false if it isn't closed. Help me a lil' to know what's already assumed?