Introduction

For the set theorist every natural number is a set. For example,

5={0,1,2,3,4}

0={}

and similarly other numbers. Extending the idea slightly we get the first transfinite cardinal of Cantor:

aleph-null={0,1,2,3, … }.

For the set theorist every fraction is a set. For example, using binary number system,

0.11000 …= {1,2}

0.10101010 …= {1,3,5,7, … }.

Thus we have the happy situation where every thing in mathematics is a set.

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