 Popper asserted that logical positivism "is defeated by its typically "inductivist prejudice"".Having highlighted Hume's problem of induction, John Maynard Keynes posed "logical probability" to answer it—but then figured not quite.Bertrand Russell held Keynes's book "A Treatise on Probability" as induction's best examination, and if read with Jean Nicod's "Le Probleme logique de l'induction" as well as R B Braithwaite's review of that in the October 1925 issue of "Mind", to provide "most of what is known about induction", although the "subject is technical and difficult, involving a good deal of mathematics".