Et moi, .. Of si javail su comment en revenir. je One selVice mathematics has rendered the ny semis point alll!. human race. It has put common sense back Jules Verne when: it belongs, on the topmon shelf next to the dusty canister labelled discarded nonsense. The series is divergent; therefore we may be Eric T. Bell able to do something with iL O. Heaviside Mathematics is a tool for thought A highly necessary tool in a world where both feedback and nonlineari- ties abound, Similarly. all kinds of parts of mathematics serve as tools for other parts and for other sci- ences, Applying a simple rewriting rule to the quote on the right above one finds such statements as: One ser- vice topology has rendered mathematical physics .., ; One service logic has rendered computer science .. .; One service category theory has rendered mathematics .. .. All arguably true. And all statements obtainable this way form part of the raison detre of this series.