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Anti-psychologism in Logic is a theory about the nature of logical truth, that it does not depend upon the contents of human ideas but exists independent of human ideas. The term was coined by Gottlob Frege (the most famous anti-psychologist of Logic), and has been the centre of an important debate in analytical philosophy, closely related to the internalism and externalism debate in logic and epistemology.
Edmund Husserl was an important proponent of anti-psychologism, and this trait passed on to other phenomenologists, such as Martin Heidegger, whose doctoral thesis was meant to be a refutation of psychologism. They shared the argument that, because the proposition "no-p is a not-p" is not logically equivalent to "It is thought that 'no-p is a not-p'", psychologism does not logically stand. Psychologism was criticized in logic also by Charles Sanders Peirce whose fields included logic, philosophy, and experimental psychology, and generally in philosophy by Maurice Merleau-Ponty who held the chairs of philosophy and child psychology at Sorbonne in France.
- Vladimir Bryushinkin. Metapsychologism In The Philosophy Of Logic. Proc. Logic and Philosophy of Logic, 20th World Congress in Philosophy, 2000.
- Dov Gabbay and John Woods. The New Logic. In Journal of the Interest Group in Pure and Applied Logic, Volume 9(2). Oxford, 2000.
- ↑ Peirce attacked the idea, held by some logicians at that time, that rationality rests on a feeling of logicality, rather than on fact. See the first of Peirce's 1903 Lowell Institute Lectures "What Makes a Reasoning Sound?", Essential Peirce v. 2, pp. 242-257. See also the portion of Peirce's 1902 Minute Logic published in Collected Papers v. 2 (1931), paragraphs 39–43. Peirce held that mathematical and philosophical logics precede psychology as a special science and that they do not depend on it for principles.
- ↑ Peirce (sometimes with Joseph Jastrow) investigated the probability judgments of experimental subjects, pioneering decision analysis. He and Jastrow wrote "On Small Differences in Sensation", Memoirs of the National Academy of Sciences (1885), 3, 73-83, presented 17 October 1884, reprinted in Collected Papers v. 7, paragraphs 21-35. Classics in the History of Psychology Eprint.
- ↑ Reynolds, Jack (as last updated 2005), "Maurice Merleau-Ponty (1908–1961)", Internet Encyclopedia of Philosophy. Eprint.
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