By Boris A. Khesin, Serge L. Tabachnikov

Vladimir Arnold, an eminent mathematician of our time, is understood either for his mathematical effects, that are many and in demand, and for his powerful critiques, frequently expressed in an uncompromising and inspiring demeanour. His dictum that "Mathematics is part of physics the place experiments are reasonable" is widely known. This booklet involves components: chosen articles by means of and an interview with Vladimir Arnold, and a suite of articles approximately him written through his associates, colleagues, and scholars. The publication is generously illustrated by way of a wide selection of images, a few by no means ahead of released. The publication provides many a side of this outstanding mathematician and guy, from his mathematical discoveries to his daredevil outdoors adventures.

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His answer was, “Sorry, I have forgotten all of it, I am no longer a number theorist: several months ago, I have turned to another domain, logic”. ” To facilitate the search of mathematical information, Russian mathematicians have tried to cover most of the present day mathematics in the more than one hundred volumes of the Encyclopædia of mathematical sciences, several dozens of which have already been translated into English. The idea of this collection was to represent the living mathematics as an experimental science, as a part of physics rather than the systematic study of corollaries of the arbitrary sets of axioms, as Hilbert and Bourbaki proposed.

If the linearized mapping is a non-resonant rotation, Birkhoﬀ was able to 9 Vinogradov was a pathological antisemite, and that was the reason that the paper, that mentioned the Gelfand–Zeitlin theory, was rejected. Arnold does not say this explicitly, but this conclusion is clear to those who are familiar with the context. ) 10 Later, when I was his graduate student (in 1961), Kolmogorov learned about the existence of diﬀerential topology from Milnor’s talk in Leningrad. He immediately suggested that I should include it in my graduate curriculum (thinking on the relations to the superposition problem).

His method was not too far from Kolmogorov’s 1954 paper, but the details were diﬀerent. His result was even better than the solution of Birkhoﬀ’s problem: he had proved the stability provided that the rotation angles of the linearized mappings were not of the form kπ/2 or kπ/3. Rational numbers with denominators higher than 4 behave in this problem like irrational numbers! The resonances of order smaller than 5 are now called strong resonances, those of higher order — weak resonances. Moser discovered that the stability holds even in the presence of resonances, provided that they are weak.