必然性 (Japanese Wikipedia)

Analysis of information sources in references of the Wikipedia article "必然性" in Japanese language version.

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oxfordreference.com

Blackburn, Simon (2008). "necessary/contingent truths". The Oxford Dictionary of Philosophy (英語) (2nd ed.). ISBN 9780199541430. Oxford Referenceより2023年8月30日閲覧。

Garson, James (2023). "Modal Logic". In Zalta, Edward N.; Nodelman, Uri (eds.). The Stanford Encyclopedia of Philosophy (英語) (Spring 2023 ed.). Metaphysics Research Lab, Stanford University. 2023年8月30日閲覧。The operator $\Diamond$ (for 'possibly') can be defined from $\Box$ by letting $\Diamond A=\neg \Box \neg A$ . In K, the operators $\Box$ and $\Diamond$ behave very much like the quantifiers $\forall$ (all) and $\exists$ (some). For example, the definition of $\Diamond$ from $\Box$ mirrors the equivalence of $\forall xA$ with $\neg \exists x\neg A$ in predicate logic.