Mathematics is a tool for thought. A highly necessary tool m a world where both feedback and non- linearities abound. Similarly, all kinds of parts of mathematics serve as tools for other parts and for
other sciences.
Applying a simple rewriting rule to the quote on the right above one finds such statements as:
One service topology has rendered mathematical physics ...'; One service logic has rendered com-
computer science ...'; One service category theory has rendered mathematics ...'. All arguably true. And
all statements obtainable this way form part of the raison d'etre of this series.