, Volume 24, Issue 4, pp 641–657 | Cite as

Nowhere-Zero 4-Flows, Simultaneous Edge-Colorings, And Critical Partial Latin Squares

  • Rong Luo
  • Wenan Zang*
  • Cun-Quan Zhang†
Original Paper

It is proved in this paper that every bipartite graphic sequence with the minimum degree δ ≥ 2 has a realization that admits a nowhere-zero 4-flow. This result implies a conjecture originally proposed by Keedwell (1993) and reproposed by Cameron (1999) about simultaneous edge-colorings and critical partial Latin squares.

Mathematics Subject Classification (2000):

05C15 05B15 05C38 05C70 05C07 


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Copyright information

© János Bolyai Mathematical Society 2004

Authors and Affiliations

  1. 1.Department of Mathematical SciencesMiddle Tennessee State UniversityMurfreesboroUSA
  2. 2.Department of MathematicsUniversity of Hong KongHong KongChina
  3. 3.Department of MathematicsWest Virginia UniversityMorgantownUSA

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