 The Principles of Mathematics by Bertrand Russell |  The Foundations of Arithmetic by Gottlob Frege |  Remarks on the Foundations of Mathematics by Ludwig Wittgenstein |  Education and the Social Order by Bertrand Russell |  Why Men Fight by Bertrand Russell |  An Inquiry into Meaning and Truth by Bertrand Russell |  The Philosophy of Mathematics by Stephan Korner |  Paradoxes by R. M. Sainsbury |  Six Great Ideas by Mortimer J. Adler |  The Examined Life by Robert Nozick |  5000 B.C. and Other Philosophical Fantasies by Raymond Smullyan |  Think: A Compelling Introduction to Philosophy by Simon Blackburn |  Kant in 90 Minutes by Paul Strathern |  Ten Philosophical Mistakes by Mortimer J. Adler |  What Does It All Mean? by Thomas Nagel |  The Meaning of Things by A. C. Grayling |  Ancient Philosophy: A Very Short Introduction by Julia Annas |  The Outer Limits of Reason by Noson S. Yanofsky |  The Seven Mysteries of Life by Guy Murchie |  Against Method by Paul Feyerabend |