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  2. An Introduction to Non-Classical Logic - Wikipedia

    en.wikipedia.org/wiki/An_Introduction_to_Non...

    The first edition is from 2001 and is titled just An Introduction to Non-Classical Logic, while the second edition, from 2008, is titled An Introduction to Non-Classical Logic: From If to Is (being a greatly improved and expanded version of the first edition).

  3. Propositional calculus - Wikipedia

    en.wikipedia.org/wiki/Propositional_calculus

    Unlike first-order logic, propositional logic does not deal with non-logical objects, predicates about them, or quantifiers. However, all the machinery of propositional logic is included in first-order logic and higher-order logics. In this sense, propositional logic is the foundation of first-order logic and higher-order logic.

  4. Jan Łukasiewicz - Wikipedia

    en.wikipedia.org/wiki/Jan_Łukasiewicz

    He thought innovatively about traditional propositional logic, the principle of non-contradiction and the law of excluded middle, offering one of the earliest systems of many-valued logic. Contemporary research on Aristotelian logic also builds on innovative works by Łukasiewicz, which applied methods from modern logic to the formalization of ...

  5. Logic - Wikipedia

    en.wikipedia.org/wiki/Logic

    4.1 Philosophy of logic and philosophical logic. ... Download as PDF; Printable version ... Propositional logic comprises formal systems in which formulae are built ...

  6. Stoic logic - Wikipedia

    en.wikipedia.org/wiki/Stoic_logic

    Stoic logic is the system of propositional logic developed by the Stoic philosophers in ancient Greece. It was one of the two great systems of logic in the classical world. It was largely built and shaped by Chrysippus , the third head of the Stoic school in the 3rd-century BCE.

  7. Laws of Form - Wikipedia

    en.wikipedia.org/wiki/Laws_of_Form

    Laws of Form (hereinafter LoF) is a book by G. Spencer-Brown, published in 1969, that straddles the boundary between mathematics and philosophy. LoF describes three distinct logical systems : The primary arithmetic (described in Chapter 4 of LoF ), whose models include Boolean arithmetic ;

  8. Principia Mathematica - Wikipedia

    en.wikipedia.org/wiki/Principia_Mathematica

    It is to be regretted that this first comprehensive and thorough-going presentation of a mathematical logic and the derivation of mathematics from it [is] so greatly lacking in formal precision in the foundations (contained in 1– 21 of Principia [i.e., sections 1– 5 (propositional logic), 8–14 (predicate logic with identity/equality), 20 ...

  9. Modus tollens - Wikipedia

    en.wikipedia.org/wiki/Modus_tollens

    In propositional logic, modus tollens (/ ˈ m oʊ d ə s ˈ t ɒ l ɛ n z /) (MT), also known as modus tollendo tollens (Latin for "method of removing by taking away") [2] and denying the consequent, [3] is a deductive argument form and a rule of inference. Modus tollens is a mixed hypothetical syllogism that takes the form of "If P, then Q ...

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