Nuprl - Some Definitions

absval	`Def \|i\| == if 0i i else -i fi` `Thm* x:. \|x\|`
int_seg	`Def {i..j} == {k:\| i k < j }` `Thm* m,n:. {m..n} Type`
lelt	`Def i j < k == ij & j < k`
le	`Def AB == B < A` `Thm* i,j:. ij Prop`
nat_plus	`Def == {i:\| 0 < i }` `Thm* Type`
le_int	`Def ij == j < i` `Thm* i,j:. ij`
not	`Def A == A False` `Thm* A:Prop. (A) 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`

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