books.google.com - For several terms at Cambridge in 1939, Ludwig Wittgenstein lectured on the philosophical foundations of mathematics. A lecture class taught by Wittgenstein, however, hardly resembled a lecture. He sat on a chair in the middle of the room, with some of the class sitting in chairs, some on the floor....http://books.google.com/books/about/Wittgenstein_s_Lectures_on_the_Foundatio.html?id=d4YUZVq1JSEC&utm_source=gb-gplus-shareWittgenstein's Lectures on the Foundations of Mathematics, Cambridge, 1939
