Two Fraïssé-style theorems for homomorphism-homogeneous relational structures
Abstract
In this paper, we state and prove two Fraïssé-style results that cover existence and uniqueness properties for twelve of the eighteen different notions of homomorphism-homogeneity as introduced by Lockett and Truss, and provide forward directions and implications for the remaining six cases. Following these results, we completely determine the extent to which the countable homogeneous undirected graphs (as classified by Lachlan and Woodrow) are homomorphism-homogeneous; we also provide some insight into the directed graph case.
Citation
Coleman , T D H 2020 , ' Two Fraïssé-style theorems for homomorphism-homogeneous relational structures ' , Discrete Mathematics , vol. 343 , no. 2 , 111674 . https://doi.org/10.1016/j.disc.2019.111674
Publication
Discrete Mathematics
Status
Peer reviewed
ISSN
0012-365XType
Journal article
Collections
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