Nuprl - Some Definitions

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	Some definitions of interest.

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

	Thm* x:. \|x\|

gcd	Def gcd(a;b) == if b=0 a else gcd(b;a rem b) fi (recursive)

	Thm* a,b:. gcd(a;b)

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

not	Def A == A False

	Thm* A:Prop. (A) Prop

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