Who Cites surjection type?
surjection_type	Def  A onto B == {f:(AB)| Surj(A; B; f) }
	Thm*  A,B:Type. A onto B  Type
surject	Def  Surj(A; B; f) == b:B. a:A. f(a) = b
	Thm*  A,B:Type, f:(AB). Surj(A; B; f)  Prop

Syntax:

A onto B

has structure:

surjection_type(A; B)

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