z 无向图(undirected graph) 哥尼斯堡七桥 Euler 图 无向图,简称图,是一个用线(边)连接在一起的节点(顶点)的集合。严 格地说,图是一个三元组 G=( V, E, I ), 其中,V 是顶点的集合,E 是边的集 合,而 I 是关联关系,它指明了 E 中的每条边与 V 中的每个顶点之间的关联关 系:每条边必定连接两个而且只有两个顶点,它们称为该边的端点
1 The eigenvalue distribution function For an N × N matrix AN , the eigenvalue distribution function 1 (e.d.f.) F AN (x) is defined as F AN (x) = Number of eigenvalues of AN ≤ x . (1) N As defined, the e.d.f. is right continuous and possibly atomic i.e. with step discontinuities at discrete points. In practical terms, the derivative of (1), referred to as the (eigenvalue) level density, is simply the
chapter 9 GRAPH ALGORITHMs $I Definitions e G(V,E) where G: =graph, V=V(G): :=finite nonempty set of vertices, andE=E(G): : = finite set of edges. d' Undirected graph:(V;,vi)=(j,vi): =the same edge 6 Directed graph(digraph): :=2* I tailhead