Some definitions of interest.
hanoi_PEG	Def  Peg == {1...3}
	Thm*  Peg  Type
int_iseg	Def  {i...j} == {k:| ik & kj }
	Thm*  i,j:. {i...j}  Type
nat	Def   == {i:| 0i }
	Thm*    Type
le	Def  AB == B<A
	Thm*  i,j:. (ij)  Prop
le_int	Def  ij == j<i
	Thm*  i,j:. (ij)

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