有限非自反同态-齐次二元关系系统
Finite irreflexive homomorphism-homogeneous binary relational systems
摘要:
如果一个结构的有限子结构之间的每一个同构都延伸到该结构的一个自同构,则该结构被称为齐次的。最近,P. J. Cameron和J. Nešetziil引入了一个放松版本的齐性:我们说一个结构是同态齐性的,如果结构的有限子结构之间的每个同态都延伸到结构的自同态。本文刻画了具有一个非自反二元关系的有限同态-齐次关系系统。
英文摘要:
A structure is called homogeneous if every isomorphism between finite substructures of the structure extends to an automorphism of the structure. Recently, P. J. Cameron and J. Nešetřil introduced a relaxed version of homogeneity: we say that a structure is homomorphism-homogeneous if every homomorphism between finite substructures of the structure extends to an endomorphism of the structure. In this paper we characterize all finite homomorphism-homogeneous relational systems with one irreflexive binary relation.
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