xii Preface to the English Edition Leon Takhtajan prepared a short appendix about the formalism of classical mechanics. It should play the role of introduction for stu- dents who did not take an appropriate course, which was obligatory at St. Petersburg University. I want to add that the idea of introducing quantum mechanics as a deformation of classical mechanics has become quite fashionable nowadays. Of course, whereas the term “deformation” is not used explicitly in the book, the idea of deformation was a guiding principle in the original plan for the lectures. L. D. Faddeev St. Petersburg, November 2008
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