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Title:The distinguishing chromatic number of Cartesian products of two complete graphs
Authors:ID Jerebic, Janja (Author)
ID Klavžar, Sandi (Author)
Files:URL http://www.imfm.si/preprinti/PDF/01045.pdf
 
Language:English
Work type:Not categorized
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract:Označitev grafa ▫$G$▫ je razlikovalna, če jo ohranja le trivialni avtomorfizem grafa ▫$G$▫. Razlikovalno kromatično število grafa ▫$G$▫ je najmanjše naravno število, za katero obstaja razlikovalna označitev grafa, ki je hkrati tudi dobro barvanje. Za vse ▫$k$▫ in ▫$n$▫ je določeno razlikovalno kromatično število kartezičnih produktov ▫$K_kBox K_n$▫. V večini primerov je enako kromatičnemu številu, kar med drugim odgovori na vprašanje Choia, Hartkeja and Kaula, ali obstajajo še kakšni drugi grafi, za katere velja enakost.
Keywords:teorija grafov, razlikovalno kromatično število, grafovski avtomorfizem, kartezični produkt grafov, graph theory, distinguishing chromatic number, graph automorphism, Cartesian product of graphs
Year of publishing:2008
Number of pages:str. 1-11
Numbering:Vol. 46, št. 1045
PID:20.500.12556/DKUM-49380 New window
ISSN:1318-4865
UDC:519.17
COBISS.SI-ID:14609753 New window
NUK URN:URN:SI:UM:DK:1LUYUIJB
Publication date in DKUM:10.07.2015
Views:1477
Downloads:95
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Categories:Misc.
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Secondary language

Language:Unknown
Title:Razlikovalno kromatično število kartezičnega produkta dveh polnih grafov
Abstract:A labeling of a graph ▫$G$▫ is distinguishing if it is only preserved by the trivial automorphism of ▫$G$▫. The distinguishing chromatic number of ▫$G$▫ is the smallest integer ▫$k$▫ such that ▫$G$▫ has a distinguishing labeling that is at the same time a proper vertex coloring. The distinguishing chromatic number of the Cartesian product $K_kBox K_n$ is determined for all ▫$k$▫ and ▫$n$▫. In most of the cases it is equal to the chromatic number, thus answering a question of Choi, Hartke and Kaul whether there are some other graphs for which this equality holds.


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