Nuprl - Some Definitions

array	`Def [T]Array == n:m:{n...}{n..m}T` `Thm* T:Type{i}. [T]Array Type{[i']}`
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`