Definition:Class Difference

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Definition

Let $A$ and $B$ be two classes.


The (class) difference $A \setminus B$ of $A$ and $B$ is defined as the class of all sets $x$ such that $x \in A$ and $x \notin B$:

$x \in A \setminus B \iff x \in A \land x \notin A$

or:

$A \setminus B = \set {x: x \in A \land x \notin B}$


Also see

  • Results about class difference can be found here.


Sources