国家重点实验室 1.The main components/elements of an information network The network in this course denotes the information network,since there are a lot of networks that are different from this one,such as the network of an organization,postal network railway network,the relation network of a family,etc. Mathematically,a network can be represented as a graph G=(n,v),where n is the set of nodes and y denotes a set of links to which nodes are connected. For an information network,a node can be the device or equipment that belongs to either users or network operators.2020/4/23 Dr. Zhanqi XU, National Key Lab on ISN, Xidian University 2  The network in this course denotes the information network, since there are a lot of networks that are different from this one, such as the network of an organization, postal network , railway network, the relation network of a family, etc.  Mathematically, a network can be represented as a graph G=(n , v), where n is the set of nodes and v denotes a set of links to which nodes are connected.  For an information network, a node can be the device or equipment that belongs to either users or network operators. 1. The main components/elements of an information network