Some definitions of interest.
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
not	Def A == A  False
	Thm* A:Prop. (A)  Prop

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