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On Diregularity of Digraphs of Defect at Most Two

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F09%3A00503056" target="_blank" >RIV/49777513:23520/09:00503056 - isvavai.cz</a>

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    On Diregularity of Digraphs of Defect at Most Two

  • Original language description

    It is easy to show that any digraph with out-degree at most d, diameter k at least 2 and order one or two less than Moore bound must have all vertices of out-degree d. However, establishing the regularity or otherwise of the in-degree of such a digraph is not easy. In this paper we prove that all digraphs of defect two are either diregular or almost diregular. Additionally, in the case of defect one we present a new, simpler and shorter, proof that a digraph of defect one must be diregular, and in the case of defect two and for d = 2 and k at least 3, we present an alternative proof that a digraph of defect two must be diregular.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    BA - General mathematics

  • OECD FORD branch

Result continuities

  • Project

  • Continuities

    S - Specificky vyzkum na vysokych skolach

Others

  • Publication year

    2009

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Journal of Combinatorial Mathematics and Combinatorial Computing

  • ISSN

    0835-3026

  • e-ISSN

  • Volume of the periodical

    71

  • Issue of the periodical within the volume

    1

  • Country of publishing house

    CA - CANADA

  • Number of pages

    18

  • Pages from-to

  • UT code for WoS article

  • EID of the result in the Scopus database