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Title:On a local 3-Steiner convexity
Authors:ID Brešar, Boštjan (Author)
ID Dravec, Tanja (Author)
Files:URL http://dx.doi.org/10.1016/j.ejc.2011.06.001
 
Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:FERI - Faculty of Electrical Engineering and Computer Science
Abstract:Za dani graf ▫$G$▫ je Steinerjev interval množice vozlišč ▫$W subset V(G)$▫ množica tistih vozlišč, ki ležijo na kakem Steinerjevem drevesu glede na ▫$W$▫. Množica ▫$U subset V(G)$▫ je ▫$g_3$▫-konveksna v ▫$G$▫, če Steinerjev interval poljubne trojice vozlišč iz ▫$U$▫ v celoti leži v ▫$U$▫. Henning, Nielsen in Oellermann (2009) so dokazali, da graf ▫$G$▫, v katerem so ▫$j$▫-krogle ▫$g_3$▫-konveksne za vsak ▫$j ge 1$▫, ne vsebuje hiše niti grafov dvojčkov ▫$C_4$▫ kot induciranih podgrafov in vsak cikel v ▫$G$▫ dolžine vsaj šest je dobro premostljiv. V tem članku dokažemo, da velja tudi obrat tega izreka, s čimer okarakteriziramo grafe z ▫$g_3$▫-konveksnimi kroglami.
Keywords:matematika, teorija grafov, Steinerjev interval, razdalja, dobra premostljivost, mathematics, graph theory, Steiner interval, distance, well-bridgeness
Year of publishing:2011
Number of pages:str. 1222-1235
Numbering:Vol. 32, no. 8
PID:20.500.12556/DKUM-51909 New window
UDC:519.17
ISSN on article:0195-6698
COBISS.SI-ID:16079193 New window
NUK URN:URN:SI:UM:DK:JORLTX3K
Publication date in DKUM:10.07.2015
Views:1219
Downloads:52
Metadata:XML DC-XML DC-RDF
Categories:Misc.
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Record is a part of a journal

Title:European journal of combinatorics
Shortened title:Eur. j. comb.
Publisher:Academic Press
ISSN:0195-6698
COBISS.SI-ID:25427968 New window

Secondary language

Language:English
Title:O lokalni 3-Steinerjevi konveksnosti
Abstract:Given a graph ▫$G$▫ and a set of vertices ▫$W subset V(G)$▫, the Steiner interval of ▫$W$▫ is the set of vertices that lie on some Steiner tree with respect to ▫$W$▫. A set ▫$W subset V(G)$▫ is called ▫$g_3$▫-convex in ▫$G$▫, if the Steiner interval with respect to any three vertices from ▫$U$▫ lies entirely in ▫$U$▫. Henning et al. (2009) proved that if every ▫$j$▫-ball for all ▫$j ge 1$▫ is ▫$g_3$▫-convex in a graph ▫$G$▫, then ▫$G$▫ has no induced house nor twin ▫$C_4$▫, and every cycle in ▫$G$▫ of length at least six is well-bridged. In this paper we show that the converse of this theorem is true, thus characterizing the graphs in which all balls are ▫$g_3$▫-convex.


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