Logicians and philosophers of mathematics discussed the mathematical Platonism with Penelope Maddy, Michael Redhead, Tim Smiley, Jeremy Butterfield, and Peter Smith. Is mathematics created by the mind or does it have an extra-mental existence, and what are the implications for philosophy?

Penelope Maddy, a leading international philosopher of mathematics came to Cambridge from the United States to lead the discussions, which, inevitably, were fascinating, paradoxical, and inconclusive.