'Et moi *...* si j'avait su comment en revenir. je One service mathematics bas rendered the n'y serais point a116.' human race. It bas put common sense back Jules Verne where it belongs. on the topmost shelf next to the dusty cauister labelled 'discarded uonsense*. The series is divergent; therefore we may be EricT. Bell able to do something with it. 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 d' 8tre of this series.