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Syntax Definition wbr 4481
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 10017.)
Hypotheses
Ref Expression
cA class 𝐴
cB class 𝐵
cR class 𝑅
Assertion
Ref Expression
wbr wff 𝐴𝑅𝐵

See definition df-br 4482 for more information.

Colors of variables: wff setvar class
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