Question: In this chapter, we attempted to define the positive numbers by the follow i ng rules : Rule 1 1 is in L. Rule 2

In this chapter, we attempted to define the positive numbers by the follow i ng rules :
Rule 1 1 is in L.
Rule 2 If x and y are in L, then so are x + y, x*y, and x/y.
The language L defined in this way is a famous mathematical set. What is it? Prove it.

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