Nuprl - Some Definitions

	Who Cites equivalence?

equivalence	`Def {T} == {f:(TT)\| (x:T. (f(x,x))) & (x,y:T. (f(x,y)) (f(y,x))) & (x,y,z:T. (f(x,y)) (f(y,z)) (f(x,z))) }`

	`Thm* T:Type{i}. {T} Type{i'}`

assert	`Def b == if b True else False fi`

	`Thm* b:. b Prop`

not	`Def A == A False`

	`Thm* A:Prop. (A) Prop`

iff	`Def P Q == (P Q) & (P Q)`

	`Thm* A,B:Prop. (A B) Prop`

rev_implies	`Def P Q == Q P`

	`Thm* A,B:Prop. (A B) Prop`

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