MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  wss Unicode version

Syntax Definition wss 3152
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  C_  B

See definition df-ss 3166 for more information.

Colors of variables: wff set class
  Copyright terms: Public domain W3C validator