wpss - Metamath Proof Explorer

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Syntax Definition wpss 4015

Description: Syntax for the proper subclass predicate.

**Hypotheses**
Ref	Expression
cA	class 𝐴
cB	class 𝐵

**Assertion**
Ref	Expression
wpss	wff 𝐴 ⊊ 𝐵

See definition df-pss 4016 for more information.

Colors of variables: wff setvar class