|Necessity, philosophy: different kinds of necessity are distinguished, differing in their strength. For example, physical, logical or metaphysical necessity. See also necessity de dicto, necessity de re._____________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. |
Jan Lukasiewicz on Necessity - Dictionary of Arguments
Berka I 145
Def Necessity/Tarski/Lukasiewicz: NMNp = NCpNp - "It is necessary that p" means: "It is not true that if p, so not-p". I.e. we can claim from a statement "a" then and only then that it is necessary if its own negation is not contained in it.(1)
>Negation, >Assertion, >Assertibility, >Statement, >Truth,
>Multi-valued logic, >Possibility.
1. 1. J. Lukasiewicz, Philosophische Bemerkungen zu mehrwertigen Systemen des Aussagenkalküls, CR Varsovie Cl. III, 23, 51-77_____________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 [Concept/Author], [Author1]Vs[Author2] or [Author]Vs[term] resp. "problem:"/"solution:", "old:"/"new:" and "thesis:" is an addition from the Dictionary of Arguments. If a German edition is specified, the page numbers refer to this edition.
Logik Texte Berlin 1983