Some definitions of interest.
exponentiation	Def  n^k == if k=0 1 else n(n^(k-1)) fi  (recursive)
	Thm*  n:, k:. (n^k)
	Thm*  n,k:. (n^k)
	Thm*  n:, k:. (n^k)
nat	Def   == {i:| 0i }
	Thm*    Type

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