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Syntax Definition wss 3863
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 𝐴𝐵

See definition df-ss 3878 for more information.

Colors of variables: wff setvar class
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