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ZF (ZERMELO-FRAENKEL) SET THEORY
ZF Set Theory - start with the Axiom of Extensionality
Basic operations on classes
The difference of two classes
cdif

Next ⟩ difjust

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Syntax definition cdif

Description: Syntax for the difference of two classes.

		Ref	Expression
	Assertion	cdif	class ( 𝐴 ∖ 𝐵 )