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Title:Median graphs, the remoteness function, periphery transversals, and geodetic number two
Authors:ID Balakrishnan, Kannan (Author)
ID Brešar, Boštjan (Author)
ID Changat, Manoj (Author)
ID Imrich, Wilfried (Author)
ID Klavžar, Sandi (Author)
ID Kovše, Matjaž (Author)
ID Subhamathi, Ajitha R. (Author)
Files:URL http://www.imfm.si/preprinti/PDF/01046.pdf
 
Language:English
Work type:Not categorized
Organization:FERI - Faculty of Electrical Engineering and Computer Science
Abstract:Periferna transverzala medianskega grafa ▫$G$▫ je vpeljana kot množica vozlišč, ki zadane vse periferije grafa $G$. S pomočjo tega koncepta so na dva različna načina karakterizirani medianski grafi z geodetskim številom 2. To so natanko tisti medianski grafi, ki vsebujejo periferno transverzalo moči 2, kot tudi medianski grafi, za katere obstaja takšen profil, da je funkcija oddaljenosti konstantna na ▫$G$▫. Predstavljen je tudi algoritem, ki v času ▫$O(m log n)$▫ odloči, ali je dani graf z ▫$n$▫ vozlišči in ▫$m$▫ povezavami medianski graf z geodetskim številom 2. Dobljenih je še več nadaljnjih lastnosti funkcije oddaljenosti na hiperkockah in medianskih grafih. Navedenih je tudi nekaj odprtih problemov.
Keywords:medianski graf, medianska množica, funkcija oddaljenosti, geodetsko število, periferna transverzala, median graph, median set, remoteness function, geodetic number, periphery transverzal, hypercube
Year of publishing:2008
Number of pages:str. 1-19
Numbering:Vol. 46, št. 1046
PID:20.500.12556/DKUM-49379 New window
ISSN:1318-4865
UDC:519.17
COBISS.SI-ID:14609497 New window
NUK URN:URN:SI:UM:DK:1WEO2T3D
Publication date in DKUM:10.07.2015
Views:1287
Downloads:61
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Categories:Misc.
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Secondary language

Language:Unknown
Title:Medianski grafi, funkcija oddaljenosti, periferne transverzale in geodetsko število dva
Abstract:A periphery transversal of a median graph ▫$G$▫ is introduced as a set of vertices that meets all the peripheral subgraphs of ▫$G$▫. Using this concept, median graphs with geodetic number 2 are characterized in two ways. They are precisely the median graphs that contain a periphery transversal of order 2 as well as the median graphs for which there exists a profile such that the remoteness function is constant on ▫$G$▫. Moreover, an algorithm is presented that decides in ▫$O(mlog n)$▫ time whether a given graph ▫$G$▫ with ▫$n$▫ vertices and ▫$m$▫ edges is a median graph with geodetic number 2. Several additional structural properties of the remoteness function on hypercubes and median graphs are obtained and some problems listed.


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