Some definitions of interest.
div_nrel	Def Div(a;n;q) == nq  a < n(q+1)
	Thm* a:, n:, q:. Div(a;n;q)  Prop
int_seg	Def {i..j} == {k:| i  k < j }
	Thm* m,n:. {m..n}  Type
nat	Def  == {i:| 0i }
	Thm*   Type
nat_plus	Def  == {i:| 0<i }
	Thm*   Type

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