Nuprl - Some Definitions

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	Some definitions of interest.

absval	Def \|i\| == if 0i i else -i fi

	Thm* x:. \|x\|

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

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

nat	Def == {i:\| 0i }

	Thm* Type

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