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- https://math.libretexts.org/Courses/Northwest_Florida_State_College/MGF_1131%3A_Mathematics_in_Context/05%3A_Voting_and_Graph_Theory/5.05%3A_GraphsImagine a freeway overpass – the freeway and side street cross, but it is not possible to change from the side street to the freeway at that point, so there is no intersection and no vertex would be p...Imagine a freeway overpass – the freeway and side street cross, but it is not possible to change from the side street to the freeway at that point, so there is no intersection and no vertex would be placed. The graph below is disconnected; there is no way to get from the vertices on the left to the vertices on the right.
- https://math.libretexts.org/Courses/Chabot_College/Math_in_Society_(Zhang)/13%3A_Graph_Theory/13.02%3A_GraphsImagine a freeway overpass – the freeway and side street cross, but it is not possible to change from the side street to the freeway at that point, so there is no intersection and no vertex would be p...Imagine a freeway overpass – the freeway and side street cross, but it is not possible to change from the side street to the freeway at that point, so there is no intersection and no vertex would be placed. The graph below is disconnected; there is no way to get from the vertices on the left to the vertices on the right.
- https://math.libretexts.org/Courses/Las_Positas_College/Math_for_Liberal_Arts/04%3A_Graph_Theory/4.01%3A_GraphsThe graph below is disconnected; there is no way to get from the vertices on the left to the vertices on the right. The problem of finding the optimal eulerization is called the Chinese Postman Proble...The graph below is disconnected; there is no way to get from the vertices on the left to the vertices on the right. The problem of finding the optimal eulerization is called the Chinese Postman Problem, a name given by an American in honor of the Chinese mathematician Mei-Ko Kwan who first studied the problem in 1962 while trying to find optimal delivery routes for postal carriers.
