One Hundred Years After Keynes Published His 'A Treatise on Probability' in 1921, Edgeworth’s Two Reviews Still Stand Out As Being Vastly Superior to the Assessments Made by Any Other Philosopher of the Logical Theory of Probability

F. Y. Edgeworth made the only correct assessment of Keynes’s Logical Theory of Probability in his A Treatise on Probability among philosophers in the 100 years between 1921 and 2020. The reason is that he actually read the entire book, with the exception of Part II, which he was able to assess through his very careful reading of Part I. The major problem confronting any philosopher, who wants to take into consideration the various different aspects of Keynes’s A Treatise on Probability, is the unfortunate fact that there is no philosopher,with the one exception of Edgeworth (Bertrand Russell did not read Part V), who has read beyond chapters 1-4 plus some parts of chapter 6 of the A Treatise on Probability. This assessment includes every philosopher associated with SIPTA, as well as B. Koopman, I. J. Good, T. L. Fine, P. Suppes, H.E. Kyburg, I.Levi, S. Zabell, as well as younger philosophers, such as B. Weatherson, D. Rowbottom, R.Bradley, S. Bradley, J. Williamson, T. Siedenfeld, G. Wheeler, etc. The conclusion reached is that after 100 years there is only one sure path currently available to philosophers who want to know what it was that Keynes actually accomplished in the A Treatise on Probability-read and reread the two reviews made by Edgeworth. A reader is then in a good position to grasp what it was that Keynes had erected in 1921-the first mathematically and technically advanced interval valued approach to probability in history. Kyburg’s claim, that he was the first to have put forth a detailed interval valued approach for a logical theory of probability, is simply a major oversight made by Kyburg. Edwin B. Wilson's conclusion, that Edgeworth was by the far the most qualified academic to review Keynes's A Treatise on Probability, still holds good 100 years after he published his reviews of Keynes's book.