Popper’s Correspondence with Harold Jeffreys

Harold Jeffreys (1891–1989) was a British scientist who mainly contributed to mathematics, statistics, Bayesian probability, geophysics and astronomy, but also published articles on other subjects. (For further biographical information cf. Cook, A. H. (1990). Sir Jeffreys, 2 April 1891 – 18 March 1989. In: Biographical Memoirs of Fellows the Royal Society 36, pp. 301–333. url: https: //royalsocietypublishing.org/doi/abs/10.1098/rsbm.1990.0034..) This letter by Popper written in context debate between nature logic, which took place journal Mind 1940 1943. starts with Popper’s article “What is Dialectic?” (Popper, K. R. (1940). What Is Dialectic? 49 (196), 403–426.), response note “Does Contradiction Entail every Proposition?” (Jeffreys, (1942). Does Proposition? 51 (201), 90–91.). announces his Jeffrey’s reproduced here; he will publish it as “Are Contradictions Embracing?” 1943; Chapter 8 this volume.). The interesting for remark probability interpretation logical formulas, well relationship formal logic methodology.