NFE Home New Foundations Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  NFE Home  >  Th. List  >  wb GIF version
Syntax Definition wb 176
Description: Extend our wff definition to include the biconditional connective.
Hypotheses
Ref Expression
wph wff φ
wps wff ψ
Assertion
Ref Expression
wb wff (φ ↔ ψ)
See definition df-bi 177 for more information.
Colors of variables: wff setvar class
  Copyright terms: Public domain W3C validator