Some definitions of interest.
hanoi_PEG	Def  Peg == {1...3}
	Thm*  Peg  Type
hanoi_otherpeg	Def  otherPeg(x; y) == 6-(x+y)
	Thm*  x,y:Peg. x  y  otherPeg(x; y)  Peg
nat_plus	Def   == {i:| 0<i }
	Thm*    Type
nequal	Def  a  b  T == a = b  T
	Thm*  A:Type, x,y:A. (x  y)  Prop

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