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Theorem modal-5 1841
Description: The analog in our 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 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
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