MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  modal-5 Unicode version

Theorem modal-5 1841
Description: The analog in our predicate calculus of axiom 5 of modal logic S5. (Contributed by NM, 5-Oct-2005.)
Assertion
Ref Expression
modal-5

Proof of Theorem modal-5
StepHypRef Expression
1 hbn1 1838 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4  A.wal 1393
This theorem was proved from axioms:  ax-10 1837
  Copyright terms: Public domain W3C validator