Some definitions of interest.
iff	Def P  Q == (P  Q) & (P  Q)
	Thm* A,B:Prop. (A  B)  Prop
imin	Def imin(a;b) == if ab a else b fi
	Thm* a,b:. imin(a;b)
le	Def AB == B<A
	Thm* i,j:. (ij)  Prop

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