Who Cites absval?
absval	Def |i| == if 0i i else -i fi
	Thm* x:. |x|
iff	Def P Q == (P Q) & (P Q)
	Thm* A,B:Prop. (A B) Prop
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
rev_implies	Def P Q == Q P
	Thm* A,B:Prop. (A B) Prop
not	Def A == A False
	Thm* A:Prop. (A) Prop
lt_int	Def i < j == if i < j true ; false fi
	Thm* i,j:. i < j
bnot	Def b == if b false else true fi
	Thm* b:. b

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