Philosophy Dictionary of Arguments

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Accessibility, philosophy: accessibility is an expression of a relationship between possible worlds. For example, a world with IT technology is not accessible from a world where the wheel has not yet been invented. See also modal logic, possible worlds, systems, S 4/S 5, knowledge, transitivity, counterpart theory, centered worlds, cross world identity.

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Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments.

 
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Maxwell J. Cresswell on Accessibility - Dictionary of Arguments

Hughes I 67f
Accessibility/possible worlds/Hughes/Cresswell: many authors: From conceivability or imaginability - e.g. game: the visibility relation between players. - Invisible worlds are not taken into account - always considered conceivability of worlds from the actual world: corresponding system T.
Necessity/T: Truth in a selected set of worlds.
System T: necessity: only considers worlds that we can imagine.
System S4: Transitivity of conceivability: what could be conceivable in other worlds. - (i.e. conceivable in a possible world, which in turn can be imagined from the actual world). - Then we have another necessity: truth in all worlds. -
System S5: all are visible to all, not a question of imagination.


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Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution. Translations: Dictionary of Arguments
The note [Author1]Vs[Author2] or [Author]Vs[term] is an addition from the Dictionary of Arguments. If a German edition is specified, the page numbers refer to this edition.

Cr I
M. J. Cresswell
Semantical Essays (Possible worlds and their rivals) Dordrecht Boston 1988

Cr II
M. J. Cresswell
Structured Meanings Cambridge Mass. 1984

Hughes I
G.E. Hughes
Maxwell J. Cresswell
Einführung in die Modallogik Berlin New York 1978


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Ed. Martin Schulz, access date 2021-05-13
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