Closeness is an important characteristic of networks. In this article we will calculate the closeness of line graphs of some basic graphs and the closeness of line graphs of connected by a bridge two basic graphs.

翻译：紧密度是网络的一个重要特征。本文将计算若干基本图的线图的紧密度，以及通过桥连接的两个基本图的线图的紧密度。