The debate between the pure or fundamentalist branch of mathematics and the applied one induces to discuss dispassionately the links between the queen of sciences and the development of technology. To avoid the existing difficulty in separating the concrete daily problems from the conceptual and theoretic reflections, it generally produces good results to show some elements of the relations between mathematics and teehnology. The autonomous position, which characterizes the mathematics of absolute freedom, clashes with the quick development of technology, which (...) creates a new structure of mathematics. This development produces a pennanent interrogation about what is building and developing anyone who calls himself a mathematician. (shrink)