Nuprl - Some Definitions

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	Some definitions of interest.

gcd_p	Def GCD(a;b;y) == y \| a & y \| b & (z:. z \| a & z \| b z \| y)

	Thm* a,b,y:. GCD(a;b;y) Prop

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

	Thm* Type

not	Def A == A False

	Thm* A:Prop. (A) Prop

sq_exists	Def x:A. B(x) == {x:A\| B(x) }

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