The nonexistence conjecture for planar covers of the displayed cover of K4K_4

Let K4K_4 be the complete graph on four vertices, and let K~4\widetilde{K}_4 be the specific cover of K4K_4 shown in Figure~. A finite planar cover K~~4K~4\widetilde{\widetilde{K}}_4\to\widetilde{K}_4 is a finite cover whose covering graph embeds in the plane. The composition with K~4K4\widetilde{K}_4\to K_4 is required to be understood as the induced cover of K4K_4.

Nonexistence conjecture for the displayed cover. For every finite planar cover

K~~4K~4,\widetilde{\widetilde{K}}_4\to\widetilde{K}_4,

the composition

K~~4K4\widetilde{\widetilde{K}}_4\to K_4

does not fulfill Properties V\mathcal{V} and E\mathcal{E}.

This conjecture concerns the final example in the paper and is presented as a stronger obstruction for that particular cover. The supplied text gives no resolution status.

Sources & referencesView supporting material

Primary source

Yo'av Rieck and Yasushi Yamashita, “On Negami's planar cover conjecture”, arXiv:math/0612342 (2006).

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