Abstract
Aristotelian logic starts from ordinary language, as we have done in the Introduction. The concepts necessary to logic, however, cannot be derived from linguistic concepts. The inference from “Some P are Q” to “Some Q are P” is, from the point of view of the English language, not formal because no formal criteria exist by which to decide which English words (sequences of morphemes) may legitimately be substituted for the variables P, Q. For example we cannot infer “Some here are men” from “Some men are here”.
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© 1965 Springer Science+Business Media Dordrecht
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Lorenzen, P. (1965). Syllogistic. In: Formal Logic. Synthese Library, vol 9. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1582-9_1
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DOI: https://doi.org/10.1007/978-94-017-1582-9_1
Publisher Name: Springer, Dordrecht
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