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Syntax Definition wss 2886
Description: Extend wff notation to include the subclass relation. This is read "A is a subclass of B " or "B includes A." When A exists as a set, it is also read "A is a subset of B."
Hypotheses
Ref Expression
cA class A
cB class B
Assertion
Ref Expression
wss wff AB

See definition df-ss 2900 for more information.

Colors of variables: wff set class
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