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arXiv 1104.3602cs.ITmath.IT
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四个随机变量的非Shannon信息不等式

Non-Shannon Information Inequalities in Four Random Variables

Randall Dougherty, Chris Freiling, Kenneth Zeger

摘要:

任何关于三个或更少随机变量的无约束信息不等式都可以写成香农不等式I(A;B)的线性组合|C)>= 0。这种不等式有时被称为“香农”不等式。在1998年,Zhang和Yeung给出了第一个关于四个变量的“非香农”信息不等式的例子。他们的技术是添加两个具有特殊性质的辅助变量,然后将香农不等式应用于扩大的列表。这里我们将证明张杨不等式实际上可以从一个辅助变量导出。然后,我们使用相同的基本技术添加辅助变量,以获得许多其他的非香农不等式的四个变量。我们的列表包括徐,王,孙发现的不等式,但它绝不是详尽无遗的。此外,得到的一些不等式可能被更强的不等式所取代,这些不等式尚未被发现。事实上,我们证明了张杨不等式是其中之一,被取代。我们还提出了几个无限族的不等式。这个列表包括一些,但不是所有的无限家庭发现马图斯。然后我们将描述这些不等式告诉我们关于熵空间的额外信息。这将包括一个猜想的最大可能失败的英格尔顿的不等式。最后,我们将提出一个应用程序的非香农不等式的网络编码。我们将展示这些不等式如何在找到可以流经称为Vamos网络的特定网络的信息的界限时有用。

英文摘要:

Any unconstrained information inequality in three or fewer random variables can be written as a linear combination of instances of Shannon's inequality I(A;B|C) >= 0 . Such inequalities are sometimes referred to as "Shannon" inequalities. In 1998, Zhang and Yeung gave the first example of a "non-Shannon" information inequality in four variables. Their technique was to add two auxiliary variables with special properties and then apply Shannon inequalities to the enlarged list. Here we will show that the Zhang-Yeung inequality can actually be derived from just one auxiliary variable. Then we use their same basic technique of adding auxiliary variables to give many other non-Shannon inequalities in four variables. Our list includes the inequalities found by Xu, Wang, and Sun, but it is by no means exhaustive. Furthermore, some of the inequalities obtained may be superseded by stronger inequalities that have yet to be found. Indeed, we show that the Zhang-Yeung inequality is one of those that is superseded. We also present several infinite families of inequalities. This list includes some, but not all of the infinite families found by Matus. Then we will give a description of what additional information these inequalities tell us about entropy space. This will include a conjecture on the maximum possible failure of Ingleton's inequality. Finally, we will present an application of non-Shannon inequalities to network coding. We will demonstrate how these inequalities are useful in finding bounds on the information that can flow through a particular network called the Vamos network.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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