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Preface Issue 3-2012

机译:前言2012年第3-期

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摘要

Although the problem of finding periodic solutions of Hamiltonian systems is easily explained, it is in many cases quite difficult to solve and in most cases still open. This question-among others-gave rise to the development of symplectic geometry. In this context, Alan Weinstein conjectured in 1978 that every hypersurface of the standard symplectic R~(2n) of so called contact type admits a closed orbit. Being of contact type generalises the notion of an object being star-shaped. The survey article of Frederica Pasquotto provides "A short history of the Weinstein conjecture". Some cases of this conjecture have been solved while in its full generality, it is still open.
机译:尽管找到哈密顿系统的周期解的问题很容易解释,但在许多情况下很难解决,而且在大多数情况下仍是未解决的。除其他问题外,这个问题引起了辛几何的发展。在这种情况下,艾伦·温斯坦(Alan Weinstein)在1978年推测,标准辛辛型R〜(2n)的每个超曲面(所谓的接触型)都允许一个闭合轨道。接触类型概括了物体为星形的概念。 Frederica Pasquotto的调查文章提供了“ Weinstein猜想的简短历史”。虽然这个猜想的某些情况已经完全解决,但仍未解决。

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