O. Pochinka

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According to Pixton [8] there are Morse-Smale diffeomorphisms of S 3 which have no energy function, that is a Lyapunov function whose critical points are all periodic points of the diffeomorphism. We introduce the concept of quasi-energy function for a Morse-Smale diffeomorphism as a Lyapunov function with the least number of critical points and construct a(More)
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