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Mutual-visibility problems on graphs of diameter twoCicerone, Serafino ...Problem vzajemne vidnosti v grafu ▫$G$▫ išče kardinalnost največje množice vozlišč ▫$S\subseteq V(G)$▫ tako, da za vsaki dve vozlišči ▫$x,y \in S$▫ obstaja najkrajša ▫$x,y$▫-pot ▫$P$▫, tako da nobeno ... notranje vozlišče ▫$P$▫ ni v ▫$S$▫. Rečemo, da sta ▫$x,y$▫ vidni glede na ▫$S$▫ ali na kratko ▫$S$▫-vidni. Znane so različice tega problema, ki temeljijo na razširitvi lastnosti vidnosti vozlišč, ki so v in/ali zunaj ▫$S$▫. Takšne različice se imenujejo celotni, zunanji in dualni problem vzajemne vidnosti. Ta članek se osredotoča na preučevanje ustreznih štirih parametrov vidnosti v grafih s premerom dva, pri čemer so v celoti prikazane meje in/ali zaprte formule za te parametre. Problem vzajemne vidnosti v kartezičnem produktu dveh polnih grafov je ekvivalenten (podprimeru) znamenitega Zarankiewiczevega problema. Tu preučujemo dualni in zunanji problem vzajemne vidnosti za kartezični produkt dveh polnih grafov ter vse probleme vzajemne vidnosti za direktni produkt takih grafov. Prav tako preučujemo vse probleme medsebojne vidnosti za grafe povezav in polne dvodelne grafe. Kot posledico te študije predstavimo nekaj povezav med omenjenimi problemi in nekaterimi primeri klasičnega Turánovega problema. Poleg tega preučujemo probleme vidnosti za kografe in več netrivialnih grafov s premerom dva najmanjše velikosti.Source: European journal of combinatorics = Journal européen de combinatoire = Europäische Zeitschrift für Kombinatorik. - ISSN 0195-6698 (Vol. 120, [article no.] 103995, Aug. 2024, 16 str.)Type of material - article, component part ; adult, seriousPublish date - 2024Language - englishCOBISS.SI-ID - 196753923
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Author | Cicerone, Serafino ... |
Title | Mutual-visibility problems on graphs of diameter two |
Publication date | 2024-08-01 |
COBISS.SI-ID | 196753923 |
Publication version in repository | Publisher's version |
Publication licence | Creative Commons Attribution 4.0 International |
Embargo | Immediate publication for public |
Project(s) from which the publication was funded
Title | Acronym | Project ID | Funder |
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Teorija grafov | P1-0297-2022 |
Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije |
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Prepletanje geometrije, topologije in algebre v strukturni in topološki teoriji grafov | N1-0218-2022 |
Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije |
|
Metrični problemi v grafih in hipergrafih | N1-0285-2023 |
Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije |
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source: European journal of combinatorics = Journal européen de combinatoire = Europäische Zeitschrift für Kombinatorik. - ISSN 0195-6698 (Vol. 120, [article no.] 103995, Aug. 2024, 16 str.)
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Cicerone, Serafino | ![]() |
Di Stefano, Gabriele | ![]() |
Klavžar, Sandi | 05949 |
Yero, Ismael G. | ![]() |
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