The nonexistence conjecture for planar covers of the displayed cover of
Let be the complete graph on four vertices, and let be the specific cover of shown in Figure~. A finite planar cover is a finite cover whose covering graph embeds in the plane. The composition with is required to be understood as the induced cover of .
Nonexistence conjecture for the displayed cover. For every finite planar cover
the composition
does not fulfill Properties and .
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.
References
Primary source
Yo'av Rieck and Yasushi Yamashita, “On Negami's planar cover conjecture”, arXiv:math/0612342 (2006).
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