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Mirrors > Home > ILE Home > Th. List > wbr  Structured version GIF version 
Description: Extend wff notation to include the general binary relation predicate. Note that the syntax is simply three class symbols in a row. Since binary relations are the only possible wff expressions consisting of three class expressions in a row, the syntax is unambiguous. 
Ref  Expression 

cA  class A 
cB  class B 
cR  class 𝑅 
Ref  Expression 

wbr  wff A𝑅B 
Colors of variables: wff set class 
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