Who Cites absval?
absval	Def |i| == if 0i i else -i fi
	Thm* x:. |x|
nat	Def == {i:| 0i }
	Thm* Type
so_lambda2	Def (1,2. b(1;2))(1,2) == b(1;2)
wellfounded	Def WellFnd{i}(A;x,y.R(x;y)) == P:(AProp). (j:A. (k:A. R(k;j) P(k)) P(j)) {n:A. P(n)}
	Thm* A:Type{i}, r:(AAProp{i}). WellFnd{i}(A;x,y.r(x,y)) Prop{i'}
le_int	Def ij == j < i
	Thm* i,j:. ij
le	Def AB == B < A
	Thm* i,j:. ij 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
not	Def A == A False
	Thm* A:Prop. (A) Prop

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