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arXiv 1502.04336cs.ITmath.IT
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具有非Shannon不等式的格

Lattices with non-Shannon Inequalities

Peter Harremoës

摘要:

我们研究存在或不存在的非香农不等式的变量相关的功能依赖。虽然四元幂集是具有非Shannon不等式的最小布尔格,但存在具有更多元的不具有非Shannon不等式的格。我们寻找的条件,确保没有非香农不等式存在。证明了三维分配格不可能有非Shannon不等式,平面模格不可能有非Shannon不等式。非香农不等式的存在性与格是否同构于群的子群格的问题有关。

英文摘要:

We study the existence or absence of non-Shannon inequalities for variables that are related by functional dependencies. Although the power-set on four variables is the smallest Boolean lattice with non-Shannon inequalities there exist lattices with many more variables without non-Shannon inequalities. We search for conditions that ensures that no non-Shannon inequalities exist. It is demonstrated that 3-dimensional distributive lattices cannot have non-Shannon inequalities and planar modular lattices cannot have non-Shannon inequalities. The existence of non-Shannon inequalities is related to the question of whether a lattice is isomorphic to a lattice of subgroups of a group.

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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