A homeomorphically irreducible spanning tree (HIST) of a graph G is a spanning tree without vertices of degree 2 in G. Malkevitch conjectured that every 4-connected plane graph has a HIST. In order to solve Malkevitch-conjecture, it is natural to show the existence of a HIST in 3-connected, internally 4-connected (or essentially 4-connected) plane graphs. In this paper, we construct 3-connected, internally 4-connected plane graphs without HISTs. Consequently, such a strategy does not work when we solve Malkevitch-conjecture.
|Number of pages||9|
|Publication status||Published - 2018 Oct|
- Homeomorphically irreducible spanning tree (HIST)
- Plane graph
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