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Title:A novel characterization of cubic Hamiltonian graphs via the associated quartic graphs
Authors:ID Bonvicini, Simona (Author)
ID Pisanski, Tomaž (Author)
Files:.pdf RAZ_Bonvicini_Simona_i2017.pdf (1,01 MB)
MD5: FECD7420A38B3B1428B98B7A66FC37B2
 
Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:ZUP - University of Primorska Press
Abstract:We give a necessary and sufficient condition for a cubic graph to be Hamiltonian by analyzing Eulerian tours in certain spanning subgraphs of the quartic graph associated with the cubic graph by 1-factor contraction. This correspondence is most useful in the case when it induces a blue and red 2-factorization of the associated quartic graph. We use this condition to characterize the Hamiltonian ▫$I$▫-graphs, a further generalization of generalized Petersen graphs. The characterization of Hamiltonian ▫$I$▫-graphs follows from the fact that one can choose a 1-factor in any ▫$I$▫-graph in such a way that the corresponding associated quartic graph is a graph bundle having a cycle graph as base graph and a fiber and the fundamental factorization of graph bundles playing the role of blue and red factorization. The techniques that we develop allow us to represent Cayley multigraphs of degree 4, that are associated to abelian groups, as graph bundles. Moreover, we can find a family of connected cubic (multi)graphs that contains the family of connected ▫$I$▫-graphs as a subfamily.
Keywords:generalized Petersen graphs, I-graphs, Hamiltonian cycles, Eulerian tours, Cayley multigraphs
Year of publishing:2017
Number of pages:str. 1-24
Numbering:Vol. 12, no. 1
PID:20.500.12556/RUP-17623 This link opens in a new window
UDC:519.17
ISSN on article:1855-3966
COBISS.SI-ID:18082649 This link opens in a new window
Publication date in RUP:02.01.2022
Views:1160
Downloads:17
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Record is a part of a journal

Title:Ars mathematica contemporanea
Publisher:Društvo matematikov, fizikov in astronomov, Društvo matematikov, fizikov in astronomov, Univerza na Primorskem, Fakulteta za matematiko, naravoslovje in informacijske tehnologije
ISSN:1855-3966
COBISS.SI-ID:239049984 This link opens in a new window

Secondary language

Language:Slovenian
Title:Nova karakterizacija kubičnih hamiltonskih grafov s pomočjo prirejenih kvartičnih grafov
Abstract:Podamo potreben in zadosten pogoj za to, da je kubični graf hamiltonski, tako da analiziramo Eulerjeve obhode v določenih vpetih poddrevesih kvartičnega grafa, prirejenega kubičnemu grafu s kontrakcijo 1-factorja. Ta korespondenca je zelo koristna v primeru, ko inducira modro in rdečo 2-factorizacijo prirejenega kvartičnega grafa. Ta pogoj uporabimo za to, da karakteriziramo hamiltonske ▫$I$▫-grafe, ki so nadaljnja posplošitev posplošenih Petersenovih grafov. Karakterizacija hamiltonskih ▫$I$▫-grafov sledi iz dejstva, da lahko v kateremkoli ▫$I$▫-grafu izberemo 1-faktor na tak način, da je ustrezni prirejeni kvartični graf grafovski sveženj, ki ima za bazni graf cikličen graf, vlakno in fundamentalna faktorizacija grafovih svežnjev pa igra vlogo modre in rdeče faktorizacije. Tehnike, ki jih razvijemo, nam omogočajo predstaviti Cayleyjeve multigrafe stopnje 4, ki so pridruženi abelskim grupam, kot grafovske svežnje. Še več, najdemo lahko družino povezanih kubičnih (multi)grafov, ki vsebuje družino povezanih ▫$I$▫-grafov kot svojo poddružino
Keywords:posplošeni Petersenovi grafi, I-grafi, hamiltonski cikli, Eulerjevi obhodi, Cayleyjevi multigrafi


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