Countable homogeneous Steiner triple systems avoiding specified subsystems
Countable homogeneous Steiner triple systems avoiding specified subsystems
复制标题
避免指定子系统的可数同质 Steiner 三重系统
DOI:
10.1016/j.jcta.2021.105434
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Horsley D
中科院分区:
文献类型:
--
作者:
Horsley D
In this article we construct uncountably many new homogeneous locally finite Steiner triple systems of countably infinite order as Fraïssé limits of classes of finite Steiner triple systems avoiding certain subsystems. The construction relies on a new embedding result: any finite partial Steiner triple system has an embedding into a finite Steiner triple system that contains no nontrivial proper subsystems that are not subsystems of the original partial system. Fraïssé's construction and its variants are rich sources of examples that are central to model-theoretic classification theory, and recently infinite Steiner systems obtained via Fraïssé-type constructions have received attention from the model theory community.
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10.1112/jlms/s2-17.3.375
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1978-06
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