User:Pocathasaigh/sandbox

Confusion. In Section Linear Systems I.3 (Problem 7 e.g.)we were taught that to determine whether a given vector is in a given set one tries to find c's that satisfy. Now in Vector Spaces I.2 (Problem 24.2) we're told that Vector (1 1) is not in the set (1 0), (0 1)when clearly c1=c2=1 would satisfy.