高级检索

    施劲松. 图与其补图特征值之和的界[J]. 华东理工大学学报(自然科学版), 2005, (6): 837-840.
    引用本文: 施劲松. 图与其补图特征值之和的界[J]. 华东理工大学学报(自然科学版), 2005, (6): 837-840.
    SHI Jin-song. Bounds on the Sum of the Eigenvalues of a Graph and Its Complement[J]. Journal of East China University of Science and Technology, 2005, (6): 837-840.
    Citation: SHI Jin-song. Bounds on the Sum of the Eigenvalues of a Graph and Its Complement[J]. Journal of East China University of Science and Technology, 2005, (6): 837-840.

    图与其补图特征值之和的界

    Bounds on the Sum of the Eigenvalues of a Graph and Its Complement

    • 摘要: 设G是n阶简单图,其补图记为G^c,λi(G)为G的第i大特征值。文中给出了图与其补图几个常见的特征值之和的界(i=1,2,…,n):-√2(n-1)(i-1)/(n-i+1)≤λi(G)+λi(G^c)≤√2(n-i)(n-1)/i (Ⅰ) 及 (n-1)≤λi(G)+λ1(G^c)≤-1+√1+2n(n-1) (Ⅱ) (Ⅱ)式中,下界可达当且仅当G为正则图。

       

    /

    返回文章
    返回