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Syntax Definition wss 3021
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."
Ref Expression
cA  class  A
cB  class  B
Ref Expression
wss  wff  A  C_  B

See definition df-ss 3034 for more information.

Colors of variables: wff set class
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