philosophy founded by Franz Brentano and Peirce, advanced by Gottlob Frege and Bertrand Russell, and continued by Rudolf Carnap, Willard Van Orman Quine, and by Hintikka's teacher Georg Henrik von Wright. For instance, in 1998 he wrote The Principles of Mathematics Revisited, which takes an exploratory stance comparable to that Russell made with his The Principles of Mathematics in 1903. Selected books For a bibliography, see Auxier and Hahn (2006). 1962. Knowledge and Belief – An Introduction to the Logic of the Two Notions 1969. Models for Modalities: Selected Essays 1975. The intentions of intentionality and other new models for modalities 1976. The semantics of questions and the questions of semantics: case studies in the interrelations of logic, semantics, and syntax 1989. The Logic of Epistemology and the Epistemology of Logic 1996. Ludwig Wittgenstein: Half-Truths and One-and-a-Half-Truths 1996. Lingua Universalis vs Calculus Ratiocinator 1996. The Principles of Mathematics Revisited 1998. Paradigms for Language Theory and Other Essays 1998. Language, Truth and Logic in Mathematics 1999. Inquiry as Inquiry: A Logic of Scientific Discovery 2004. Analyses of Aristotle 2007. Socratic Epistemology: Explorations of Knowledge-Seeking by Questioning See also Rudolf Carnap Saul Kripke Charles Sanders Peirce Willard Van Orman Quine Alfred Tarski Ludwig Wittgenstein Doxastic logic Hintikka set Notes Further reading Auxier, R.E., & Hahn, L. (eds.) 2006. The Philosophy of Jaakko Hintikka (The Library of Living Philosophers). Open Court. Includes a complete bibliography of Hintikka's publications. Bogdan, Radu (ed.) 1987. Jaakko Hintikka. Kluwer Academic Publishers. Kolak, Daniel 2001. On Hintikka. Wadsworth. Kolak, Daniel & Symons, John (eds.) 2004. Quantifiers, Questions and Quantum Physics: Essays on the Philosophy of Jaakko Hintikka. Springer. External links Jaakko Hintikka's personal website Philosopher Jaakko Hintikka reveals love affair between his wife and JFK. Helsinki Times. Jaakko Hintikka in 375 humanists – 20 May 2015. Faculty of Arts, University of Helsinki. 1929 births 20th-century Finnish philosophers 21st-century Finnish philosophers Analytic philosophers Florida State University faculty Game theorists 2015 deaths Logicians Members of the Norwegian Academy of Science and Letters Foreign Members of the Russian Academy of Sciences Modal logicians People from Vantaa Philosophers of language Philosophers of mathematics Rolf Schock Prize laureates Boston University faculty Finnish expatriates in the United States Harvard Fellows Members of the American Philosophical Society