Some definitions of interest.
ge	Def ij == ji
	Thm* i,j:. (ij)  Prop
gt	Def i>j == j<i
	Thm* i,j:. (i>j)  Prop
int_lower	Def {...i} == {j:| ji }
	Thm* i:. {...i}  Type
int_seg	Def {i..j} == {k:| i  k < j }
	Thm* m,n:. {m..n}  Type

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