Geodesic
Removable Edges on a Hamilton Cycle or Outside a Cycle in a 4-Connected Graph
Discussiones Mathematicae. Graph Theory, Tome 41 (2021) no. 2, pp. 559-587

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Let G be a 4-connected graph. We call an edge e of G removable if the following sequence of operations results in a 4-connected graph: delete e from G; if there are vertices with degree 3 in G−e, then for each (of the at most two) such vertex x, delete x from G − e and turn the three neighbors of x into a clique by adding any missing edges (avoiding multiple edges). In this paper, we continue the study on the distribution of removable edges in a 4-connected graph G, in particular outside a cycle of G or in a spanning tree or on a Hamilton cycle of G. We give examples to show that our results are in some sense best possible.
Keywords: 4-connected graph, removable edge, fragment, atom 
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Wu, Jichang; Broersma, Hajo; Mao, Yaping; Ma, Qin. Removable Edges on a Hamilton Cycle or Outside a Cycle in a 4-Connected Graph. Discussiones Mathematicae. Graph Theory, Tome 41 (2021) no. 2, pp. 559-587. http://geodesic.mathdoc.fr/item/DMGT_2021_41_2_a13/