wss - Metamath Proof Explorer

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Syntax Definition wss 3883

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 𝐴 ⊆ 𝐵

See definition df-ss 3900 for more information.

Colors of variables: wff setvar class

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