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A. O. Ivanov Hong Van Le Moscow State University A. A. Tuzhilin 《Journal of Mathematical Sciences》2004,119(1):55-70
One-dimensional branching extremals of Lagrangian-type functionals are considered. Such extremals appear as solutions to the classical Steiner problem on a shortest network, i.e., a connected system of paths that has the smallest total length among all the networks spanning a given finite set of terminal points in the plane. In the present paper, the Manhattan-length functional is investigated, with Lagrangian equal to the sum of the absolute values of projections of the velocity vector onto the coordinate axes. Such functionals are useful in problems arising in electronics, robotics, chip design, etc. In this case, in contrast to the case of the Steiner problem, local minimality does not imply extremality (however, each extreme network is locally minimal). A criterion of extremality is presented, which shows that the extremality with respect to the Manhattan-length functional is a global topological property of networks. Bibliography: 95 titles. 相似文献
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Armen Glebovich SERGEEV Steklov Mathematical Institute Russian Academy of Sciences Gubkina Street Moscow Russia 《中国科学A辑(英文版)》2008,(4)
We study harmonic maps from Riemann surfaces M to the loop spacesΩG of compact Lie groups G,using the twistor approach.We conjecture that harmonic maps of the Riemann sphere CP~1 intoΩG are related to Yang-Mills G-fields on R~4. 相似文献
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Moscow State University 《Differential Equations》2005,41(6):895-908
Chronicle
On the Seminar on Qualitative Theory of Differential Equations at Moscow State University 相似文献26.