Philosophy Lexicon of Arguments

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Modalities: modalities are in modal logic possibility, necessity and contingency.

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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Wessel I 347
Modality/Wessel: modality is not a kind of truth value, as often is falsely assumed!
Carnap: identifies truth and logical necessity,
Lukasiewicz: has a third truth value "possible"
Lorenzen: uses "possible" and "possibly true" synonymously. WesselVsLorenzen.
Truth value/Wessel: a truth value is a special logical predicate to which statements are pronounced or denied.
The difference between modalities and truth values is obvious: since alethic modalities are only linked to subjects of the form sA (the fact that A) and truth values are linked only to such with those of the form tA (the statement A) to connect statements.
Truth value: is a statement.
Modality: is a fact.

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.

Lorn I
P. Lorenzen
Constructive Philosophy Cambridge 1987

We I
H. Wessel
Logik Berlin 1999

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Ed. Martin Schulz, access date 2018-05-24