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A-Level数学-图表与网络Graphs and Networks


三立教育 ap.sljy.com

A-Level 数学-图表与网络 Graphs and Networks
Revision: Graphs and Networks Definitions In a complete graph every node is connected by an arc to each of the other nodes. There are 1/2*n (n-1) arcs in a complete graph with n nodes. In a connected graph there are no isolated nodes. A trail is a sequence of arcs such that the end node of one arc is the start node of the next. A closed trail (or cycle) is a route through the nodes which starts and finishes in the same place. No arc is used more than once. Only the start node is used more than once. A path is a trail where no node is passed more than once. The order of a node is the number of arcs meeting at that node. An Eulerian graph is a connected graph which has a closed trail containing every arc precisely once. This can occur if and only if every node is even. A semi-Eulerian graph is a connected graph which has a trail (not closed) containing every arc precisely once. It occurs when a graph has 2 odd nodes: the trail starts at one odd node and ends at the other. A planar graph is one which can be drawn so that arcs do not cross each other. Matrix formulation

三立教育 ap.sljy.com Networks can be represented by matrices. If the network has only 2 way links (no arrows) the matrix is symmetrical about a diagonal drawn from top left to bottom right.


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