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  • Using equality in the Krein conditions to prove nonexistence of certain distance-regular graphs
    Coolsaet, Kris ; Jurišić, Aleksandar
    Dokažemo, da razdaljno-regularni grafi s presečnim zaporedjem ▫$\{74,54,15;1,9,60\}$▫ in ▫$${4r^3+8r^2+6r+1, 2r(r+1)(2r+1), 2r^2+2r+1; 1, 2r(r+1), (2r+1)(2r^2+2r+1)}$$▫, kjer je ▫$r$▫ poljubno ... naravno število, ne obstajajo. Oba primera služita kot ilustracija za tehniko, ki nam pomaga določiti strukturne lastnosti razdaljno-regularnih grafov in asociativnih shem z dovolj velikim številom ničelnih Kreinovih parametrov.
    Source: Journal of combinatorial theory. Series A. - ISSN 0097-3165 (Vol. 115, iss. 6, 2008, str. 1086-1095)
    Type of material - article, component part
    Publish date - 2008
    Language - english
    COBISS.SI-ID - 15264601

    Link(s):

    http://dx.doi.org/10.1016/j.jcta.2007.12.001

source: Journal of combinatorial theory. Series A. - ISSN 0097-3165 (Vol. 115, iss. 6, 2008, str. 1086-1095)

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