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Syntax Definition wer 7500
Description: Extend the definition of a wff to include the equivalence predicate.
Hypotheses
Ref Expression
cA class 𝐴
cR class 𝑅
Assertion
Ref Expression
wer wff 𝑅 Er 𝐴

See definition df-er 7503 for more information.

Colors of variables: wff setvar class
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