As a result, we discuss that the Z_p×Z_P- coverings of Heawood graph are all -regular graphs, here p (?) (mod7), furthermore a new infinite family of cubic -regular graphs is constructed.

As a result, we discuss that the Z_p×Z_P- coverings of Heawood graph are all -regular graphs, here p (?) (mod7), furthermore a new infinite family of cubic -regular graphs is constructed.

最后本文还论述了若素数p满足p≡(mod7),Heawood图的Z_p×Z_p—覆盖都是-正则图,从而得到了一类新的-正则的度图。