If we calculate the change in entropy during gas mixing, we will find that this quantity is positive.

如果我们计算气体混合过程中熵的变化，我们会发现这个量是正的。

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As to decision table, positive domain reduction, entropy reduction, distributive reduction, distribution reduction, approximate reduction and so on are introduced from different views.

对于决策表，人们从不同的角度出发，提出了正域约简、熵约简、分布约简、分配约简、近似约简等约简理论与方法。

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In this paper we discuss the topological entropy of a tree map and obtain several equivalent conditions for a tree map with positive topological entropy.

本文讨论树映射的拓扑熵，得到树映射具有正拓扑熵的几个等价条件。

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