NOTE:

k is just a notation for {0..k}

	Who Cites int seg?
int_seg	Def {i..j} == {k:| i k < j }
	Thm* m,n:. {m..n} Type
int_upper	Def {i...} == {j:| ij }
	Thm* n:. {n...} Type
lelt	Def i j < k == ij & j < k
le	Def AB == B < A
	Thm* i,j:. ij Prop
not	Def A == A False
	Thm* A:Prop. (A) Prop

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