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dc.contributor.authorHuczynska, S.
dc.contributor.authorRuškuc, N.
dc.identifier.citationHuczynska , S & Ruškuc , N 2017 , ' On well quasi-order of graph classes under homomorphic image orderings ' , European Journal of Combinatorics , vol. 63 , pp. 164-175 .
dc.identifier.otherPURE: 247347625
dc.identifier.otherPURE UUID: b8747d3b-28df-4cca-844e-e811076f335a
dc.identifier.otherScopus: 85017186047
dc.identifier.otherWOS: 000402344100012
dc.identifier.otherORCID: /0000-0003-2415-9334/work/73702015
dc.identifier.otherORCID: /0000-0002-0626-7932/work/74117788
dc.description.abstractIn this paper we consider the question of well quasi-order for classes defined by a single obstruction within the classes of all graphs, digraphs and tournaments, under the homomorphic image ordering (in both its standard and strong forms). The homomorphic image ordering was introduced by the authors in a previous paper and corresponds to the existence of a surjective homomorphism between two structures. We obtain complete characterisations in all cases except for graphs under the strong ordering, where some open questions remain.
dc.relation.ispartofEuropean Journal of Combinatoricsen
dc.rights© 2017 Elsevier Ltd. All rights reserved. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectQA Mathematicsen
dc.titleOn well quasi-order of graph classes under homomorphic image orderingsen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.Pure Mathematicsen
dc.contributor.institutionUniversity of St Andrews.School of Mathematics and Statisticsen
dc.contributor.institutionUniversity of St Andrews.Centre for Interdisciplinary Research in Computational Algebraen
dc.description.statusPeer revieweden

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