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Syntax Definition wss 2911
Description: Extend wff notation to include the subclass relation. This is read " is a subclass of " or " includes ." When exists as a set, it is also read " is a subset of ."
Hypotheses
Ref Expression
cA
cB
Assertion
Ref Expression
wss  C_

See definition df-ss 2925 for more information.

Colors of variables: wff set class
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