Who Cites nat to nat pair?
nat_to_nat_pair	Def  nat_to_nat_pair(i) == next_nat_pair{i}(<0,0>)
	Thm*  nat_to_nat_pair
next_nat_pair	Def  next_nat_pair(xy) == xy/x,y. if y=0 <0,x+1> else <x+1,y-1> fi
	Thm*  next_nat_pair
compose_iter	Def  f{i}(x) == if i=0 x else f(f{i-1}(x)) fi  (recursive)
	Thm*  f:(AA), i:. f{i}  AA
eq_int	Def  i=j == if i=j true ; false fi
	Thm*  i,j:. (i=j)

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