In the third part (Chapter 3), we study the complexity of semigroup actions using complexity functions of open covers.

第三部分(第三章)，着重从半群作用的复杂性函数出发，研究了系统的复杂性。

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Finally, for the minimal continuous map, we show that the requirement of "no-dense" in the definition of scattering using open covers is not necessary.

最后，证明了对极小的连续映射而言，在用开覆盖定义的扩散中，对“非稠”的要求是不必要的。

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How would it strike you if you knew nothing about it, if you had never heard of it before, if you open up the covers of this book for the first time?

如果你对新约一无所知，如果你对新约为所未闻，如果这是你，第一次翻开新约，会有什么感觉？

耶鲁公开课 - 新约课程节选

Using this technique, EADS has printed metal hinges for engine covers: the hinges allow the covers to swing open for engine maintenance.

FORBES: GE and EADS Are Developing Processes to Print Airplane Parts

Tickets to the afternoon celebration cost 120 Danish krone, but the fee also covers a morning open air church service, a festival for families and admission to the Lincoln Log Cabin, a cedar log cabin within the park that serves as a museum for the history of the Danish emigrant experience.

BBC: Celebrate American independence in Denmark

This slideshow covers ever the US Open venue you can play in their entirety.

FORBES: US Open Venues You Can Play