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Uniformly dissociated graphsBrešar, Boštjan ; Hartnell, Bert L. ; Rall, Douglas F.Množica vozlišč ▫$D$▫ grafa ▫$G$▫ se imenuje disociacijska množica, če ima vsako vozlišče množice ▫$D$▫ največ enega soseda iz ▫$D▫$. Pravimo, da je graf enakomerno disociiran, če imajo vse njegove ... maksimalne disociacijske množice isto moč. V članku dokažemo karakterizacije enakomerno disociiranih grafov z majhnimi močmi disociacijskih množic; tako so grafi, v katerih imajo vse maksimalne disociacijske množice dva elementa, natanko polni grafi na vsaj dveh vozliščih, iz katerih so lahko odstranjene tudi povezave kakega prirejanja, medtem ko so grafi, v katerih so vse maksimalne disociacijske množice moči 3, natanko komplementi geodetskih grafov z diametrom 2, ki nimajo induciranih podgrafov izomorfnik ▫$K_4$▫. Predstavimo tudi splošno konstrukcijo, s katero lahko poljuben graf vložimo kot induciran podgraf v nek enakomerno disociiran graf. Glavni rezultat je karakterizacija enakomerno disociiranih grafov, v katerih so vsi cikli dolžine vsaj 7, kot grafov, ki so bodisi izomorfni grafu ▫$C_7$▫ ali pa jih lahko dobimo iz poljubnega grafa ▫$H$▫, v katerem so vsi cikli dolžine vsaj 7, tako da identificiramo vsako vozlišče grafa ▫$H$▫ z listom kopije grafa ▫$P_3$▫.Source: Ars mathematica contemporanea. - ISSN 1855-3966 (Vol. 13, no. 2, 2017, str. 293-306)Type of material - article, component part ; adult, seriousPublish date - 2017Language - englishCOBISS.SI-ID - 18064729
Author
Brešar, Boštjan |
Hartnell, Bert L. |
Rall, Douglas F.
Topics
disociacijsko število |
dobro pokriti grafi |
ožina |
Moore-ovi grafi |
polarnostni grafi
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Brešar, Boštjan | 17005 |
Hartnell, Bert L. | ![]() |
Rall, Douglas F. | ![]() |
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