Def		prime(a)	[prime]	num thy 1
Def		a ~ b	[assoced]	num thy 1
Def		b | a	[divides]	num thy 1
Def		P  Q	[iff]	core
Def		P  Q	[implies]	core
Def		x:A. B(x)	[all]	core
Def			[nat]	int 1
Def		AB	[le]	core
Def		A	[not]	core
Def		P & Q	[and]	core
Def		x:A. B(x)	[exists]	core
Def		Prop	[prop]	core
Def			[nat_plus]	int 1
Def		P  Q	[rev_implies]	core

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