"This new edition of the Tractatus updates the classic translation by Ogden and Ramsey and includes many helpful additional texts, including several by philosophers ranging from Plato to Russell who substantively influenced Wittgenstein's project. It will be an invaluable resource, both for students who are encountering Wittgenstein's work for the first time and for scholars who wish to understand the work better in its historical, conceptual, and philosophical context." -- Paul Livingston, University of New Mexico