| 31. | Robert Solovay proved that the modal logic GL is complete with respect to Peano Arithmetic.
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| 32. | Tableaux calculi for modal logic take into account that formulae may refer to different worlds.
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| 33. | Modal logic is most commonly interpreted in terms of possible world semantics or Kripke structures.
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| 34. | There is also an intuitionistic version of modal logic S4 called Constructive Modal Logic CS4.
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| 35. | This is necessarily true of all classical modal logics.
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| 36. | There is also an intuitionistic version of modal logic S4 called Constructive Modal Logic CS4.
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| 37. | Modal logics are generally characterized by invariances under bisimulation.
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| 38. | Formal ethics has four axioms in addition to the axioms of predicate and modal logic.
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| 39. | Modal logics is another approach which also applies .)
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| 40. | Modal logic also offers a variety of inferences that cannot be captured in propositional calculus.
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