Three utilities problem

（重定向自Utility graph）

The utility graph, also known as the Thomsen graph or K3,3

The classical mathematical puzzle known as the three utilities problem; the three cottages problem or sometimes water, gas and electricity can be stated as follows:

The problem is an abstract mathematical puzzle which imposes constraints that would not exist in a practical engineering situation.

单词	Utility graph
释义	Utility graph 英语百科 Three utilities problem （重定向自Utility graph） The classical mathematical puzzle known as the three utilities problem; the three cottages problem or sometimes water, gas and electricity can be stated as follows: The problem is an abstract mathematical puzzle which imposes constraints that would not exist in a practical engineering situation.
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