Suppose V is a vector space and B = {u1,u2,u3} is a set of vectors in V, and none of the
vectors u1,u2,u3 is the zero vector.
a. What is a linear combination of u1,u2,u3?
b. How many vectors are in span {u1,u2,u3} Explain.
c. What does it mean to say that {u1,u2,u3} is a basis for V?
