کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4647229 | 1342335 | 2015 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ordering (signless) Laplacian spectral radii with maximum degrees of graphs
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
ریاضیات گسسته و ترکیبات
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Let λ(G) and μ(G) be the Laplacian and signless Laplacian spectral radius of a graph G, respectively, and let Î(G) be the maximum degree of G. We call a graph G an (n,m) graph if G contains n vertices and m edges. In this paper, we prove that for two connected (n,m) graphs G and Gâ², if Î(G)â¥mânâ32 and Î(G)>Î(Gâ²), then λ(G)>λ(Gâ²) and μ(G)>μ(Gâ²), and the bound “mânâ32” is optimal for the case of signless Laplacian spectral radius. Moreover, we use an example to illustrate that, as a consequence of our new result, when mâ¤â3nâ52â, the ordering of connected (n,m) graphs according to their largest (signless) Laplacian spectral radii can be transfer to the ordering of connected (n,m) graphs with large maximum degree and hence we can conclude that it is not a difficult problem to ordering connected (n,m) graphs via their largest (signless) Laplacian spectral radii.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Discrete Mathematics - Volume 338, Issue 2, 6 February 2015, Pages 159-163
Journal: Discrete Mathematics - Volume 338, Issue 2, 6 February 2015, Pages 159-163
نویسندگان
Muhuo Liu, Bolian Liu, Bo Cheng,