Determine whether the subset S x y z x greaterthanorequalto
Solution
We have S = {(x , y, z): x 0} . Let be an arbitrary scalar and let (x, y, z) be an arbitrary member of S. Then x 0. Now, (x,y,z) = (x, y, z). Since x 0 when is negative, hence S is not closed under scalar multiplication. Therefore, S is not a subspace of R3.
