Who Cites inject?
inject	Def  Inj(A; B; f) == a1,a2:A. f(a1) = f(a2)  B  a1 = a2
	Thm*  A,B:Type, f:(AB). Inj(A; B; f)  Prop

Syntax:

Inj(A; B; f)

has structure:

inject(A; B; f)

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