排序方式: 共有11条查询结果,搜索用时 15 毫秒
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周后卿 《浙江大学学报(理学版)》2018,45(1):10
对近年来图的Laplacian谱半径上界的研究成果进行了简单梳理.利用2个图的卡氏积图的特征值,讨论了2个循环图的卡氏积图的Laplacian谱半径的上界问题,得到了几个上界,推广了已有文献的结论. 相似文献
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周后卿 《浙江大学学报(理学版)》2016,43(5):517-520
Circulant graphs are an important class of network topology. Let G be a simple graph with n vertices, let A be the adjacency matrix of G, and λ1,λ2,…,λn be the eigenvalues of graph G. As a kind of centrality of complex networks, the resolvent Estrada index of G is defined as EEr(G)=((1-λi)/(n-1))-1. By Ramanujan's sum, using the Euler function and Mobius function, we characterize the lower bound of resolvent Estrada index of circulant graph, and obtain some computational formulas of integral circulant graphs. 相似文献
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Let G =(V, E) be a simple connected graph with n(n ≥ 3) vertices and m edges,with vertex degree sequence {d1, d2,..., dn}. The augmented Zagreb index is defined as AZI =AZI(G)=∑ij∈E(didj/di+dj-2)3. Using the properties of inequality, we investigate the bounds of AZI for connected graphs, in particular unicyclic graphs in this paper, some useful conclusions are obtained. 相似文献
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浅议"数学分析"中的定理教学 总被引:1,自引:0,他引:1
学习“数学分析”中的定理,不仅只是要知道、会用其结论,而且更需要掌握定理的证法,这是提高数学理论素养的一种行之有效的方法. 相似文献
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利用权分担值的思想,对具有三个CM公共值的非常数亚纯函数的唯一性问题进行了研究,所得结果改进了Lahird的部分结论. 相似文献
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A graph is called an integral graph if it has an integral spectrum i.e.,all eigenvalues are integers.A graph is called circulant graph if it is Cayley graph on the circulant group,i.e.,its adjacency matrix is circulant.The rank of a graph is defined to be the rank of its adjacency matrix.This importance of the rank,due to applications in physics,chemistry and combinatorics.In this paper,using Ramanujan sums,we study the rank of integral circulant graphs and gave some simple computational formulas for the rank and provide an example which shows the formula is sharp. 相似文献
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不等式证明中的概率思想方法 总被引:1,自引:0,他引:1
不等式的证明往往比较复杂,有时直观含义也比较抽象,代数的方法难以发挥作用。如果能够建立适当的概率模型,赋以一些随机事件或随机变量的具体含义,再利用概率的理论加以证明,则常常能使证明过程得到简化。同时还可以为抽象的数学问题提供具体的概率背景,沟通各数学分支之间的联系。文中通过几个不等式的证明阐明了常用的概率思想方法。 相似文献