Meigu Guan

Meigu Guan (Chinese: 管梅谷, also Romanized as Mei-Ko Kwan or Mei-ku Kuan, born 1934 in Shanghai) was a Chinese researcher who "became one of the leading experts on mathematical programming in China". He is known for his research on the route inspection problem, and served as president of Shandong Normal University.

Guan is known for formulating the route inspection problem. This problem is a generalization of the Euler tour problem, in which the input is an edge-weighted graph and the goal is to find a closed walk of minimum total weight that visits every graph edge at least once. Its applications include transportation planning problems such as planning routes for a fleet of snowplows to plow all the streets of a city, in minimum total time.

Guan worked as a lecturer at Shandong Normal University during the Great Leap Forward of 1958–1960, during which Chinese mathematicians were encouraged to work on practical problems. He published his work on the route inspection problem in 1960, and his paper was translated into English in 1962. It attracted the attention of Jack Edmonds, who gave the problem its alternative name, the "Chinese postman problem", in honor of Guan, and proved that this problem can be solved optimally in polynomial time.

One of Guan's later contributions was to prove that, in contrast, the windy postman problem is NP-complete; this is a generalized version of the route inspection problem in which the cost of traversing an edge depends on the direction in which it is traversed.

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