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arXiv 2007.05761math.RA
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从预桁架到斜撑

From pre-trusses to skew braces

Tomasz Brzeziński, Stefano Mereta, Bernard Rybołowicz

摘要:

引入了预桁架的概念,即集既是堆又是半群的概念。研究了预桁架本身以及满足单侧或双侧分配律的预桁架。它们分别被称为近桁架和斜桁架。预桁架中的同余对应于这里定义为满足特定封闭性的子堆的典范。近桁架对应于斜撑和近环,通过其典型和理想的结构识别。在预桁架中的规则元素被定义为导致(预桁架)域的概念。后者被描述为完全的主要典范,也在此定义。引入了满足Ore条件的正则预桁架作为域,定义了分式预桁架。特别是,它表明,近桁架的分数没有吸收器对应于斜撑。

英文摘要:

The notion of a pre-truss, that is, a set that is both a heap and a semigroup is introduced. Pre-trusses themselves as well as pre-trusses in which one-sided or two-sided distributive laws hold are studied. These are termed near-trusses and skew trusses respectively. Congruences in pre-trusses are shown to correspond to paragons defined here as sub-heaps satisfying particular closure property. Near-trusses corresponding to skew braces and near-rings are identified through their paragon and ideal structures. Regular elements in a pre-truss are defined leading to the notion of a (pre-truss) domain. The latter are described as quotients by completely prime paragons, also defined hereby. Regular pre-trusses as domains that satisfy the Ore condition are introduced and the pre-trusses of fractions are defined. In particular, it is shown that near-trusses of fractions without an absorber correspond to skew braces.

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