I= {1, 2}
list all possible subsets of the given set.

There are four subsets of this set:

1) The null set.

2) Itself ({1,2})

3) {1)

4) {2}

     An interesting thing about set theory (which studies the above}.  I thought for years

that set theory was abstract.  Then, a friend of mine studied set theory as a

master's degree thesis in applied mathematics at a local university! 

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