Recognition of Elements of sets
Liner algebra object are mainly represented by sets and their elements. Inability to recognize the elements of a set can be detrimental in understanding the basic of linear algebra. For instance in order to determine the elements of the subset S, a set of all 2*2 symmetric matrices,of a set of all 2*2 matrices one needs to recognize matrices of 2*2 size and furthermore be aware that not any 2*2 matrix is a member of the subset S.