論理学

Logic is a formal science that is part of mathematics and philosophy. It is the study of condition, conclusion, and validity, and it has the effect of logical consequence. The field includes classical logic, fuzzy logic, quantum logic, and propositional calculus. It is practiced by logicians.

The subject is described by sources including The Nuttall Encyclopædia, the Jewish Encyclopedia of Brockhaus and Efron, the Brockhaus and Efron Encyclopedic Dictionary, and the Encyclopædia Britannica 11th edition. It is maintained by WikiProject Mathematics and appears on focus lists such as Wikipedia:List of articles all languages should have and Wikipedia:Vital articles/Level/4. A PubMed query for logic yields a count of 68137. Additionally, the topic is referenced by 3,433 other encyclopedia articles.