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Theorem modal-5 1733
Description: The analog in our "pure" predicate calculus of axiom 5 of modal logic S5. (Contributed by NM, 5-Oct-2005.)
Ref Expression

Proof of Theorem modal-5
StepHypRef Expression
1 hbn1 1730 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wi 4  wal 1540
This theorem was proved from axioms:  ax-6 1729
This theorem is referenced by: (None)
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