Nuprl - Some Definitions

decidable	`Def Dec(P) == P P` `Thm* A:Prop. Dec(A) Prop`
equiv_rel	`Def EquivRel x,y:T. E(x;y) == Refl(T;x,y.E(x;y)) & Sym x,y:T. E(x;y) & Trans x,y:T. E(x;y)` `Thm* T:Type, E:(TTProp). (EquivRel x,y:T. E(x,y)) Prop`
identity	`Def Id(x) == x` `Thm* A:Type. Id AA`
iff	`Def P Q == (P Q) & (P Q)` `Thm* A,B:Prop. (A B) Prop`
int_seg	`Def {i..j} == {k:\| i k < j }` `Thm* m,n:. {m..n} Type`
nat	`Def == {i:\| 0i }` `Thm* 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`
trans	`Def Trans x,y:T. E(x;y) == a,b,c:T. E(a;b) E(b;c) E(a;c)` `Thm* T:Type, E:(TTProp). Trans x,y:T. E(x,y) Prop`
sym	`Def Sym x,y:T. E(x;y) == a,b:T. E(a;b) E(b;a)` `Thm* T:Type, E:(TTProp). Sym x,y:T. E(x,y) Prop`
refl	`Def Refl(T;x,y.E(x;y)) == a:T. E(a;a)` `Thm* T:Type, E:(TTProp). Refl(T;x,y.E(x,y)) Prop`
rev_implies	`Def P Q == Q P` `Thm* A,B:Prop. (A B) Prop`

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