Some definitions of interest.
hanoi_PEG	Def  Peg == {1...3}
	Thm*  Peg  Type
hanoi_peg_perm	Def  permute(p to r ; q to s)(u) == if u=p r ; u=q s else otherPeg(r; s) fi
	Thm*  p,r,q,s:Peg. p  q  r  s  permute(p to r ; q to s)  PegPeg
nequal	Def  a  b  T == a = b  T
	Thm*  A:Type, x,y:A. (x  y)  Prop

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