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首页> 外文期刊>Journal of the European Mathematical Society: JEMS >The entropy conjecture for diffeomorphisms away from tangencies
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The entropy conjecture for diffeomorphisms away from tangencies

机译:远离切线的微分态的熵猜想

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摘要

We prove that every C1 diffeomorphism away from homoclinic tangencies is entropy expansive, with locally uniform expansivity constant. Consequently, such diffeomorphisms satisfy Shub's entropy conjecture: the entropy is bounded from below by the spectral radius in homology. Moreover, they admit principal symbolic extensions, and the topological entropy and metrical entropy vary upper semicontinuously with the map. In contrast, generic diffeomorphisms with persistent tangencies are not entropy expansive.
机译:我们证明,远离同斜切线的每个C1微分都是熵扩张的,具有局部一致的扩张常数。因此,这样的亚纯性满足了Shub的熵猜想:熵从下方受到同构谱半径的限制。此外,他们接受主要的符号扩展,并且拓扑熵和度量熵随图上半连续变化。相比之下,具有持续切线的泛型微分同态并不是熵膨胀的。

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