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A study on Ramsey-type problem concerning cycle partitions in graphs

Research Project

Project/Area Number 23740095
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field General mathematics (including Probability theory/Statistical mathematics)
Research InstitutionYokohama City University (2013-2014)
Maebashi Institute of Technology (2012)
Gunma National College of Technology (2011)

Principal Investigator

FUJITA Shinya  横浜市立大学, 国際総合科学部, 准教授 (60424206)

Project Period (FY) 2011-04-28 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsグラフのラムゼー数 / グラフの閉路 / グラフの辺着色 / 極値グラフ理論 / ハイパーグラフ / グラフの極値問題 / 国際情報交換 / ハンガリー / 国際研究者交流
Outline of Final Research Achievements

In this study, I worked on a conjecture concerning cycle partitions in graphs, which is an important unsolved problem in graph (Ramsey) theory. As a result, although I could not solve this conjecture completely, I obtained some partial results towards the conjecture and also obtained many important results in graph theory. In particular, I could give a substantial contribution to the study of cycles in graphs.

Report

(5 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • 2012 Research-status Report
  • 2011 Research-status Report
  • Research Products

    (32 results)

All 2014 2013 2012 2011

All Journal Article (17 results) (of which Peer Reviewed: 17 results,  Open Access: 1 results,  Acknowledgement Compliant: 3 results) Presentation (15 results) (of which Invited: 1 results)

  • [Journal Article] A note on covering edge colored hypergraphs by monochromatic components2014

    • Author(s)
      藤田慎也,古谷倫貴,Andras Gyarfas,Agnes Toth
    • Journal Title

      Electronic Journal of Combinatorics

      Volume: 21(2)

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Rainbow domination numbers on graphs with given radius2014

    • Author(s)
      藤田慎也,古谷倫貴
    • Journal Title

      Discrete Applied Mathematics

      Volume: 166 Pages: 115-122

    • DOI

      10.1016/j.dam.2013.10.020

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] A connected subgraph maintaining high connectivity2014

    • Author(s)
      藤田慎也,河原林健一
    • Journal Title

      European Journal of Combinatorics

      Volume: 35 Pages: 245-255

    • DOI

      10.1016/j.ejc.2013.06.014

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Minimum degree conditions for vertex-disjoint even cycles in large graphs2014

    • Author(s)
      Shuya Chiba, Shinya Fujita, Ken-ichi Kawarabayashi, Tadashi Sakuma
    • Journal Title

      ADVANCES IN APPLIED MATHEMATICS

      Volume: 54 Pages: 105-120

    • DOI

      10.1016/j.aam.2013.12.001

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Forbidden rainbow subgraphs that force large highly connected monochromatic subgraphs2013

    • Author(s)
      Shinya Fujita, Colton Magnant
    • Journal Title

      SIAM Journal on Discrete Mathematics

      Volume: 27 Issue: 3 Pages: 1625-1637

    • DOI

      10.1137/120896906

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Revisit of Erdos-Gallai's theorem on the circumference of a graph2013

    • Author(s)
      Shinya Fujita, Linda Lesniak
    • Journal Title

      Information Processing Letters

      Volume: 113 Issue: 17 Pages: 646-648

    • DOI

      10.1016/j.ipl.2013.05.015

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Forbidden subgraphs generating almost the same sets2013

    • Author(s)
      Shinya Fujita, Michitaka Furuya, Kenta Ozeki
    • Journal Title

      Combinatorics, Probability and Computing

      Volume: 22 Issue: 5 Pages: 733-748

    • DOI

      10.1017/s0963548313000254

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Covering vertices by a specied number of disjoint cycles, edges and isolated vertices2013

    • Author(s)
      Shuya Chiba, Shinya Fujita
    • Journal Title

      DISCRETE MATHEMATICS

      Volume: 313 Issue: 3 Pages: 269-277

    • DOI

      10.1016/j.disc.2012.10.010

    • Related Report
      2013 Research-status Report 2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Partition of graphs and hypergraphs into monochromatic connected parts2012

    • Author(s)
      Shinya Fujita, Michitaka Furuya, Andras Gyarfas, Agnes Toth
    • Journal Title

      Electronic Journal of Combinatorics

      Volume: 19

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Extensions of Gallai-Ramsey results2012

    • Author(s)
      Shinya Fujta, Colton Magnant
    • Journal Title

      Journal of Graph Theory

      Volume: 70 Issue: 4 Pages: 404-426

    • DOI

      10.1002/jgt.20622

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Generalized Ramsey numbers for graphs with three disjoint cycles versus a complete graph2012

    • Author(s)
      Shinya Fujita
    • Journal Title

      Electronic Journal of Combinatorics

      Volume: 14

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] k-rainbow domatic numbers2012

    • Author(s)
      Shinya Fujita, Michitaka Furuya, Colton Magnant
    • Journal Title

      Discrete Applied Mathematics

      Volume: 160 Issue: 7-8 Pages: 1104-1113

    • DOI

      10.1016/j.dam.2012.01.010

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Rainbow k-connection in Dense Graphs (Extended Abstract)2011

    • Author(s)
      Shinya Fujita, Henry Liu, Colton Magnant
    • Journal Title

      Electronic Notes in Discrete Mathematics

      Volume: Vol. 38 Pages: 361-366

    • DOI

      10.1016/j.endm.2011.09.059

    • Related Report
      2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] High connectivity keeping connected subgraph2011

    • Author(s)
      Shinya Fujita, Ken-ichi Kawarabayashi
    • Journal Title

      Electronic Notes in Discrete Mathematics

      Volume: Vol. 38 Pages: 355-360

    • DOI

      10.1016/j.endm.2011.09.058

    • Related Report
      2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] Gallai-Ramsey numbers for cycles2011

    • Author(s)
      Shinya Fujita, Colton Magnant
    • Journal Title

      Discrete Mathematics

      Volume: Vol. 311 Issue: 13 Pages: 1247-1254

    • DOI

      10.1016/j.disc.2009.11.004

    • Related Report
      2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] Properly colored paths and cycles2011

    • Author(s)
      Shinya Fujita, Colton Magnant
    • Journal Title

      Discrete Applied Mathematics

      Volume: Vol. 159 Issue: 14 Pages: 1391-1397

    • DOI

      10.1016/j.dam.2011.06.005

    • Related Report
      2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] Some remarks on long monochromatic cycles in edge-colored complete graphs2011

    • Author(s)
      Shinya Fujita
    • Journal Title

      Discrete Mathematics

      Volume: Vol. 311 Issue: 8-9 Pages: 688-689

    • DOI

      10.1016/j.disc.2011.01.016

    • Related Report
      2011 Research-status Report
    • Peer Reviewed
  • [Presentation] Safe set problem on graphs2014

    • Author(s)
      藤田慎也,Gary MacGillivray,佐久間雅
    • Organizer
      応用数学合同研究集会
    • Place of Presentation
      龍谷大学
    • Year and Date
      2014-12-18 – 2014-12-20
    • Related Report
      2014 Annual Research Report
  • [Presentation] Safe set problem on graphs2014

    • Author(s)
      藤田慎也,Gary MacGillivray,佐久間雅
    • Organizer
      Bordeaux Graph Workshop
    • Place of Presentation
      ボルドー(フランス)
    • Year and Date
      2014-11-19 – 2014-11-22
    • Related Report
      2014 Annual Research Report
  • [Presentation] A note on covering edge colored hypergraphs by monochromatic components2014

    • Author(s)
      藤田慎也,古谷倫貴,Andras Gyarfas,Agnes Toth
    • Organizer
      日本数学会秋季総合分科会
    • Place of Presentation
      広島大学
    • Year and Date
      2014-09-25 – 2014-09-28
    • Related Report
      2014 Annual Research Report
  • [Presentation] From edge-coloring to strong edge-coloring2014

    • Author(s)
      Valentin Borozan, Gerard Jennhwa Chang, Nathann Cohen, Shinya Fujita, N Narayanan, Reza Naserasr, Petru Valicov
    • Organizer
      日本数学会年会(応用数学分科会)
    • Place of Presentation
      学習院大学
    • Related Report
      2013 Research-status Report
  • [Presentation] Monochromatic structure in edge-colored graphs2013

    • Author(s)
      Shinya Fujita
    • Organizer
      国際会議 8th Japanese-Hungarian Symposium on Discrete Mathematics and Its Applications
    • Place of Presentation
      Veszprem, Hungary
    • Related Report
      2013 Research-status Report
  • [Presentation] Partitioning a graph into highly connected subgraphs2013

    • Author(s)
      Valentin Borozan, Shinya Fujita, Michitaka Furuya, Yannis Manoussakis, N Narayaban
    • Organizer
      日本数学会秋季総合分科会(応用数学分科会)
    • Place of Presentation
      愛媛大学
    • Related Report
      2013 Research-status Report
  • [Presentation] Revisit of Erdos-Gallai's theorem on the circumference of a graph2013

    • Author(s)
      藤田慎也、Linda Lesniak
    • Organizer
      日本数学会年会
    • Place of Presentation
      京都大学(京都府)
    • Related Report
      2012 Research-status Report
  • [Presentation] On several covering problems in edge-colored graphs2013

    • Author(s)
      Shinya Fujita
    • Organizer
      Eighteenth Coast Combinatorics Conference
    • Place of Presentation
      Sheraton Kona Hotel(米国)
    • Related Report
      2012 Research-status Report
  • [Presentation] Recent progress on monochromatic structure in edge-colored complete graphs2012

    • Author(s)
      藤田慎也
    • Organizer
      離散数学とその応用研究集会2012
    • Place of Presentation
      茨城大学(茨城県)
    • Related Report
      2012 Research-status Report
    • Invited
  • [Presentation] Cycles in graphs with given independence number2012

    • Author(s)
      Shinya Fujita
    • Organizer
      Cycles in graphs
    • Place of Presentation
      Vanderbilt大学(米国)
    • Related Report
      2012 Research-status Report
  • [Presentation] Almost spanning monochromatic subgraphs in edge-colored complete graphs2012

    • Author(s)
      Shinya Fujita
    • Organizer
      4th Pacific Workshop on Discrete Mathematics
    • Place of Presentation
      Tokai University Pacific Center(米国)
    • Related Report
      2012 Research-status Report
  • [Presentation] Some remarks on long monochromatic cycles in edge-colored complete graphs II2012

    • Author(s)
      Shinya Fujita
    • Organizer
      日本数学会年会
    • Place of Presentation
      東京理科大学
    • Related Report
      2011 Research-status Report
  • [Presentation] Rainbow k-connection in Dense Graphs2011

    • Author(s)
      Shinya Fujita, Henry Liu, Colton Magnant
    • Organizer
      応用数学合同研究集会
    • Place of Presentation
      龍谷大学
    • Related Report
      2011 Research-status Report
  • [Presentation] Long path lemma concerning connectivity and independence number2011

    • Author(s)
      Shinya Fujita, Alexander Halperin, Colton Magnant
    • Organizer
      国際会議Paul Turan Memorial Conference
    • Place of Presentation
      ブダペスト、ハンガリー
    • Related Report
      2011 Research-status Report
  • [Presentation] High connectivity keeping connected subgraph2011

    • Author(s)
      Shinya Fujita, Ken-ichi Kawarabayashi
    • Organizer
      国際会議EUROCOMB2011
    • Place of Presentation
      ブダペスト、ハンガリー
    • Related Report
      2011 Research-status Report

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Published: 2011-08-05   Modified: 2019-07-29  

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