The failure forms of rock materials in axisymmetric compression are studied based on the discontinuous bifurcation theory, and a set of experimental data of marbles are simulated.

采用不连续分叉理论，分析了轴对称状态下岩石材料的破坏形式，并采用一组大理岩的实验结果进行了模拟计算。

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However, the data set associated with the 16 countries is occasionally discontinuous for some variables over the period of 1995 and 2008, particularly corporate tax rate.

然而，16个国家对某些变量在1995年和2008年期间相关的数据集是偶尔不连续的，特别是企业税率。

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In this paper, some properties of the periodic functions without minimum period are shown, the main results are: the functions are discontinuous everywhere and the set of periods is dense.

本文讨论了无最小周期的周期函数性质，论证了无最小周期的周期函数的处处不连续性以及这种周期函数的周期构成的集合的稠密性。

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