Natural deduction

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Natural deduction is a branch of mathematical logic developed in Poland in the 1920s and 30s. It is meant to express inference rules closely related to the "natural" way of reasoning.

Spurred on by a series of seminars in Poland in 1926 by Łukasiewicz that advocated a more natural treatment of logic, Jaśkowski made the earliest attempts at defining a more natural deduction. In 1929 he first suggested in 1929 using a diagrammatic notation, and later updated his proposal in papers in 1934 and 1935.[1]

References[change | change source]

  1. Jaśkowski, Stanaslaw 1934. On the rules of suppositions in formal logic.
  • Jon Barwise and John Etchemendy, 2000. Language, proof and logic. CSLI (University of Chicago Press) and New York: Seven Bridges Press. A gentle introduction to first-order logic via natural deduction, by two first rate logicians.

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