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For the beginners I have often shown different paths to solutions of a problem, so they might estimate the (dis)advantage of one method over another. Thus, the reader should appreciate the employment of symmetry at an early stage. It is equally important to realise that physics, unlike mathematics, is not an exact science, but an approximation to the mathematical description of processes in nature, usually relying on a number of simplifying assumptions. In selecting the various assumptions the physicist is trained to choose the important over the unimportant effects and to set up a sensibly simple model. In fact, classical mechanics has its limitations, as astronomers found out a long time ago, and nowadays these limitations have been overcome by taking account of relativistic effects. Also, the mechanics of the microscopic world is governed by quantum theory. Thus, I have tried to concentrate on the practical applications of the principles and on the calculational techniques rather than on the construction of a theory as such. Even though the structure and method of theoretical physics is an exciting topic (in particular for the advanced physicist), I believe that it is indispensable to have a hands-on understanding of the theory with its basic results and of the techniques if one wants to handle and apply them in practice. Therefore, this book is an introduction to theoretical mechanics rather than an introduction to formal theoretical physics...