一句话:研究具有有界严格宽度的有限有界齐次二元核的一阶扩张的关系宽度,推进关系宽度有界性分类。
论文研究有限有界齐次二元核的一阶扩张的关系宽度。已知有限结构的关系宽度若有界,则只能为 (1,1) 或 (2,3)。本文聚焦的二元核带有相等关系及若干反自反二元关系,且任意两个不同元素之间恰有一个二元关系成立;作者在这些核具有有界严格宽度的条件下,考察其一阶扩张的关系宽度会受到何种限制。工作属于模型论与约束满足理论的交叉,通过分析核的齐次性、有限有界性与严格宽度等结构性质,推进对关系宽度有界性的理解。
The relational width of a finite structure, if bounded, is always (1, 1) or (2, 3). In this paper we study the relational width of first-order expansions of finitely bounded homogeneous binary cores where binary cores are structures with equality and some anti-reflexive binary relations such that for any two different elements a, b in the domain there is exactly one binary relation R with (a, b) ϵ R.