時間:2023年6月14日 星期三 9:00-11:00
地點:東校區(qū)二教203
報告題目:The s-hamiltonian line graph problem
報告人:賴虹建教授
邀請人:游志福
報告摘要:Thomassen posed the conjecture that every 4-connected line graph is hamiltonian in 1984. Matthews-Sumner conjectured that every 4-connected claw-free graph is hamiltonian. In 1999, Ryjachek introduced the line graph closure of a claw-free graph and showed that the two conjectures above are equivalent. In 2004, Kuczel and L. Xiong further conjectured that every 4-connected line graph is hamiltonian-connected, and in 2011, Ryjachek and Vrana conjectured that every 4-connected claw-free graph is hamiltonian connected, and showed that all 4 conjectures presented above are equivalent. All these conjectures are sufficient conditions. In 1987, Broersma and Veldman raised the problem to investigate necessary and sufficient conditions for a line graph to be s-hamiltonian. In this talk, we will present our considerations of seeking necessary and sufficient condition version of the Thomassen conjecture in the format of the s-hamiltonian line graphs and claw-free graphs, and the related developments and progresses.
報告人簡介:美國西弗吉尼亞大學(xué)數(shù)學(xué)系終身教授,博士生導(dǎo)師,國際知名的圖論專家,主要研究領(lǐng)域包括圖論中的歐拉子圖、哈密爾頓性問題、整數(shù)流以及圖論中的染色和連通度問題,出版學(xué)術(shù)著作兩部,發(fā)表學(xué)術(shù)論文250余篇。完成了兩部專著:由克魯亞學(xué)術(shù)出版社(Kluwer Academic Publishing)出版的“圖與組合學(xué)中的矩陣論”和由高等教育出版社出版的“擬陣論”。1996年獲學(xué)院最優(yōu)科研獎,2006年獲學(xué)院最優(yōu)教師獎和全校最優(yōu)教師獎,成為西弗吉尼亞大學(xué)歷史上第一個獲此榮譽的華裔教授。曾主持過1996年由美國國家自然科學(xué)基金會資助的紀(jì)念凱特林(Catlin)教授的歐拉圖問題專題會議,2008年由美國國家自然科學(xué)基金會資助的第46屆美國中西部圖論會議,以及2018年的第59屆美國中西部圖論會議。曾任Discrete Mathematics雜志客座編輯,現(xiàn)擔(dān)任Applied Mathematics和Graphs and Combinatorics等多個雜志的編輯。
歡迎各位老師同學(xué)們前來參加!
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