OT VIO BUENO is Professor of Philosophy at the University of Miami, USA. He has held visiting professorships or fellowships at Princeton University, University of York (in the UK), University of Leeds, and University of Sao Paulo. His main research interests are in the philosophy of mathematics, philosophy of science, and philosophy of logic. A YSTEIN LINNEBO is a Reader in Philosophy at the University of Bristol, UK. He obtained a PhD in Philosophy from Harvard University in 2002 and an MA in Mathematics from the University of Oslo in 1995. His main research interests are in the philosophies of logic and mathematics, metaphysics and the philosophy of language.