"It is refreshing to find a physicist joining today's ongoing public conversation about the nature of mathematics... As a physicist who loves mathematics, in Converging Realities [Roland Omnes] comes forward with a new idea, which he proposes to call 'physism.' ... I hope Omnes's daring proposal is taken seriously by those interested in these matters and receives the analysis and critique it deserves."--Reuben Hersh, American Scientit "Roland Omnes provides a systematic development of mathematics and classical reality and then the quantum world, with specific notes on the associated mathematical structures and historical developments. He argues persuasively, with many examples, how the realm of the possible (mathematics) and the realm of the actual (physics) are converging yet distinct realities."--Choice