|Necessity de re: is a controversial form of necessity which assumes that it can be stated about objects whether or not they necessarily have certain properties. The counter position is that necessity can only be assumed de dicto, i.e. as a property of the linguistic forms with which can be spoken about objects. See also de dicto, de re, planet example._____________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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|Berka I 145
Def need / necessary / Tarski / Lukasiewicz: NMNp = NCpNp - "it is necessary that p" means "it is not true that if p, then not-p." We can claim of a statement "a" that it is necessary iff its own negation is not included in it._____________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.
Logic, Semantics, Metamathematics: Papers from 1923-38 Indianapolis 1983
K. Berka/L. Kreiser
Logik Texte Berlin 1983