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Mirrors > Home > ILE Home > Th. List > wss  Structured version GIF version 
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 ⊆ B 
Colors of variables: wff set class 
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