Who Cites prev nat pair?
prev_nat_pair	Def  prev_nat_pair(xy) == xy/x,y. if x=0 <y-1,0> else <x-1,y+1> fi
	Thm*  prev_nat_pair  {xy:()| xy = <0,0>   }
eq_int	Def  i=j == if i=j true ; false fi
	Thm*  i,j:. (i=j)

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