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Ideas of Max J. Cresswell, by Text
[New Zealand, fl. 1968, At Victoria Univesity, Wellington, NZ.]
7.1
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p.137
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14970
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Normal system K has five axioms and rules
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7.1.1
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p.140
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14971
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D is valid on every serial frame, but not where there are dead ends
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7.1.2
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p.141
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14972
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S4 has 14 modalities, and always reduces to a maximum of three modal operators
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7.1.2
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p.141
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14973
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In S5 all the long complex modalities reduce to just three, and their negations
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7.1.2
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p.141
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14974
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A relation is 'Euclidean' if aRb and aRc imply bRc
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7.2.1
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p.149
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14975
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A de dicto necessity is true in all worlds, but not necessarily of the same thing in each world
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7.2.2
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p.151
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14976
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Reject the Barcan if quantifiers are confined to worlds, and different things exist in other worlds
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