Joachim Schulte

Wittgenstein's last work, _On Certainty_, is widely regarded as his third masterpiece of philosophy and one of his most enigmatic writings. _On Certainty_ explores the ways in which claims of indisputable knowledge are expressed, and how language forms the basis of such claims. _On Certainty_ has largely been read as representing a break with Wittgenstein's previous thinking, but this study places these ideas firmly in the development of his thought since the 1930s. _Wittgenstein on Certainty and Doubt_ illuminates Wittgenstein's examination of the logical features of epistemic terms—such as 'know', 'believe' and 'doubt'—and his interrogation of the foundations of human knowledge, the extent to which our knowledge is immune from doubt, and the conflicts between different articulations of knowledge.

Anhand eines Vergleichs mit den Stilbegriffen Spenglers und Goethes lassen sich in Wittgensteins Schriften wenigstens drei Bedeutungen des Wortes "Stil" auseinanderhalten: (1) Stil im Sinne einer individuellen, persönlichen Eigenart; (2) Stil im Sinnes des Geistes einer Kultur oder Epoche; (3) Stil im Sinne einer zeit- oder kulturtypischen Ausdrucksform, die zwar prägend, aber nicht zwingend verbindlich ist. Eine Erörterung des Stils in den Bedeutungen (2) und (3) zeigt, inwieweit dieser Begriff bei Wittgenstein "relativistisch" — d.h. kultur- und epochengebunden — aufgefaßt wird.

Friedrich Waismann (1896–1959) was one of the most gifted students and collaborators of Moritz Schlick. Accepted as a discussion partner by Wittgenstein from 1927 on, he functioned as spokesman for the latter’s ideas in the Schlick Circle, until Wittgenstein’s contact with this most faithful interpreter was broken off in 1935 and not renewed when exile took Waismann to Cambridge. Nonetheless, at Oxford, where he went in 1939, and eventually became Reader in Philosophy of Mathematics (changing later to Philosophy of Science), Waismann made important and independent contributions to analytic philosophy and philosophy of science (for example in relation to probability, causality and linguistic analysis). The full extent of these only became evident later when the larger (unpublished) part of his writings could be studied. His first posthumous work The Principles of Linguistic Philosophy (1965, 2nd edn.1997; German 1976) and his earlier Einführung in das mathematische Denken (1936) have recently proved of fresh interest to the scientific community. This late flowering and new understanding of Waismann’s position is connected with the fact that he somewhat unfairly fell under the shadow of Wittgenstein, his mentor and predecessor. Central to this book about a life and work familiar to few is unpublished and unknown works on causality and probability. These are commented on in this volume, which will also include a publication of new or previously scattered material and an overview of Waismann’s life.

A surveyable representation produces precisely that kind of understanding which consists in ‘seeing connections’. Most of the sentences that go to make up the remarks of Philosophical Investigations can be found in manuscript passages written in June 1931. On 20 November of the same year Wittgenstein writes a letter in reply to a request from Schlick and complains, not only about his own sluggishness, but also about Waismann's inclination to misrepresent his own ideas. In fact, Spengler says a number of things about Weltanschauungen, and it may well be that several passages could be seen to fill the bill. In a way, nonfactual intermediate links, which begins by mentioning 'hypothetical' connecting links and says that they are merely supposed to draw attention to connections between facts. But an hypothetical connecting link should in this case do nothing but direct the attention to the similarity, the relatedness, of the facts.