What is " "?

When you are given a set in a general form you can quite easily come up with a spanning set. You just split up the general form into vectors containing one and only one of the variables. For instance, " ", and then take out the variables and you will have yous spanning set. So here " " would become " " which is a member of your spanning set.

You then have to ask if this spanning set is a basis or not. That is, is it linearly independent.