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Mirrors > Home > ILE Home > Th. List > modal-5 | Unicode version |
Description: The analog in our predicate calculus of axiom 5 of modal logic S5. (Contributed by NM, 5-Oct-2005.) |
Ref | Expression |
---|---|
modal-5 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | hbn1 1631 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-5 1424 ax-gen 1426 ax-ie2 1471 ax-ial 1515 |
This theorem depends on definitions: df-bi 116 df-tru 1335 df-fal 1338 |
This theorem is referenced by: (None) |
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