11) Suppose there is a set A and another set B.
The set "A" is called as a subset of set "B" if all the elements of A
are also the elements of B.
If A is a subset of B, but A is not equal to B (i.e. there exists at least one element of B not contained in A), then
A is also a proper subset of B.
2) The SET of all subsets of a set is the POWER SET.
Suppose, A={1,2,}
Then, P(A) = { null,{1},{2},{1,2}}
NOTE : Universal set is not the SET of all subsets.
It is the just the listing of elements in a single set,whereas
in power set each element is considered as a SET.
3) P(A) denotes power set.
4) The traditional method or what?
