• “When academics say there is “more than one logic,” they’re referring to the existence and study of various systems of logic beyond classical logic, each with its own rules and principles.”
  • So in informal use, “logic” refers to the explanatory reasoning, systematic connections, and underlying principles governing decisions, physical processes, strategies, or algorithmic sequences – even if this “logic” doesn’t conform to strict formal logical axioms.
  • “These various logics allow philosophers, mathematicians, and computer scientists to tailor their approaches to reasoning and analysis more effectively for different kinds of problems and contexts.
  • “Modal Logic: Extends classical logic by introducing modalities—expressions like “necessarily” and “possibly.” Modal logic helps analyze concepts involving possibility, necessity, and time.”
  • “Fuzzy Logic: Deals with reasoning that is approximate rather than fixed and exact. Fuzzy logic is used in cases where the truth values of variables may be any real number between 0 and 1.”

What do academics mean when they say there is more than one logic?


These various logics are not contradictory. Correct?


Does Intuitionist logic contradict classical logic in that it rejects the law of the excluded middle?


Provide examples of the logical structures for each of the following logics.

  • Classical Logic
  • Modal Logic
  • Intuitionistic Logic
  • Fuzzy Logic
  • Deontic Logic
  • Temporal Logic

How is the term logic used informally to reflect someone’s reasoning or a physical process?


Create a 10-item quiz on the entire thread above.


Provide 15 discussion questions relevant to the content above.



Phil Stilwell

Phil picked up a BA in Philosophy a couple of decades ago. After his MA in Education, he took a 23-year break from reality in Tokyo. He occasionally teaches philosophy and critical thinking courses in university and industry. He is joined here by ChatGPT, GEMINI, CLAUDE, and occasionally Copilot, Perplexity, and Grok, his far more intelligent AI friends. The seven of them discuss and debate a wide variety of philosophical topics I think you’ll enjoy.

Phil curates the content and guides the discussion, primarily through questions. At times there are disagreements, and you may find the banter interesting.

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