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Title:Decompositions of the wreath product of certain directed graphs into directed hamiltonian cycles
Authors:ID Lacaze-Masmonteil, Alice (Author)
Files:.pdf AMC_Lacaze-Masmonteil_2026.pdf (538,63 KB)
MD5: AFA896BC60265916B2FF18E33E5F4AF2
 
Language:English
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:ZUP - University of Primorska Press
Abstract:We affirm several special cases of a conjecture that first appears in Alspach et al. (1987) which stipulates that the wreath (lexicographic) product of two hamiltonian decomposable di- rected graphs is also hamiltonian decomposable. Specifically, we show that the wreath product of hamiltonian decomposable directed graph G, such that |V (G)| is even and |V (G)| ⩾ 3, with a directed m-cycle such that m ⩾ 4 or the complete symmetric directed graph on m vertices such that m ⩾ 3, is hamiltonian decomposable. We also show the wreath product of a directed n-cycle, where n is even, with a directed m-cycle, where m ∈ {2, 3}, is not hamiltonian decomposable.
Keywords:wreath product, decompositions, hamiltonian cycle, directed graphs
Publication date:30.01.2026
Publisher:Založba Univerze na Primorskem
Year of publishing:2026
Number of pages:26 str.
Numbering:Vol. 26, no. 2, [article no.] P2.04
PID:20.500.12556/RUP-22783 This link opens in a new window
UDC:51
eISSN:1855-3974
DOI:10.26493/1855-3974.3471.51f This link opens in a new window
Publication date in RUP:17.03.2026
Views:191
Downloads:5
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Record is a part of a journal

Title:Ars mathematica contemporanea
Publisher:Založba Univerze na Primorskem
ISSN:1855-3974

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Title:Razčlenitve venčnega produkta določenih usmerjenih grafov na usmerjene hamiltonske cikle
Abstract:Potrdimo več posebnih primerov domneve, ki se je prvič pojavila pri Alspachu et al. (1987) in določa, da je venčni (leksikografski) produkt dveh usmerjenih grafov, ki sta razčlenljiva na hamiltonske cikle, prav tako razčlenljiv na hamiltonske cikle. Natančneje, pokažemo, da je venčni produkt hamiltonsko razčlenljivega usmerjenega grafa G, za katerega velja, da je |V (G)| sodo in |V (G)| ⩾ 4, z usmerjenim m-ciklom, kjer je m ⩾ 4, ali s popolnim simetričnim usmerjenim grafom na m vozliščih, kjer je m ⩾ 3, hamiltonsko razčlenljiv. Pokažemo tudi, da venčni produkt usmerjenega n-cikla, kjer je n sodo, z usmerjenim m-ciklom, kjer je m ∈ {2, 3}, ni hamiltonsko razčlenljiv.
Keywords:venčni produkt, dekompozicija, hamiltonski cikel, usmerjeni graf


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