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Syntax Definition wbr 4025
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. (For an example of how syntax could become ambiguous if we are not careful, see the comment in cneg 9040.)
Hypotheses
Ref Expression
cA  class  A
cB  class  B
cR  class  R
Assertion
Ref Expression
wbr  wff  A R B

See definition df-br 4026 for more information.

Colors of variables: wff set class
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