In graph theory, a branch of mathematics, the **Chinese postman problem (CPP)**, **postman tour** or **route inspection problem** is to find a shortest closed path or circuit that visits every edge of a (connected) undirected graph. When the graph has an Eulerian circuit (a closed walk that covers every edge once), that circuit is an optimal solution.

Alan Goldman of the U.S. National Bureau of Standards first coined the name 'Chinese Postman Problem' for this problem, as it was originally studied by the Chinese mathematician Mei-Ku Kuan in 1962.

Read more about Route Inspection Problem: Eulerian Paths and Circuits, *T*-joins, Solution, Variants

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“It is part of the educator’s responsibility to see equally to two things: First, that the *problem* grows out of the conditions of the experience being had in the present, and that it is within the range of the capacity of students; and, secondly, that it is such that it arouses in the learner an active quest for information and for production of new ideas. The new facts and new ideas thus obtained become the ground for further experiences in which new problems are presented.”

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