On semicontinuous lattices and their distributive reflections

On semicontinuous lattices and their distributive reflections
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半连续格子及其分布反射

DOI:
10.1007/s00012-016-0368-1
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发表时间:
2016-01
影响因子:
0.6
通讯作者:
Xu Luoshan
Xu Luoshan
中科院分区:
数学4区
文献类型:
--
作者:
He Qingyu;Xu Luoshan

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本文主要研究Rav在1989年提出的完备格的非连续性及其分配反射。本文证明了对完备格L,分配反射L同构于由集合包含序Lin的主理想所确定的所有根的格,从而得到了刻画给定格的分配反射的一种方法.证明了如果完备格L是连续的,且每个半素元素x ∈ L都是最大的ind(x),则只要分配反射子是Scott连续的,则L是连续的.我们构造了反例来证实一个猜想,并解决了Zhao在1997年提出的两个公开问题。
In this paper, we are mainly concerned with semicontinuity of complete lattices and their distributive reflections, introduced by Rav in 1989. We prove that for a complete latticeL, the distributive reflectionLdis isomorphic to the lattice of all radicals determined by principal ideals ofLin the set-inclusion order, obtaining a method to depict the distributive reflection of a given lattice. It is also proved that if a complete latticeLis semicontinuous and every semiprime elementx∈Lis the largest ind(x), thenLdis continuous whenever the distributive reflectordis Scott continuous. We construct counterexamples to confirm a conjecture and solve two open problems posed by Zhao in 1997.
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