Subcubic planar graphs of girth 7 are class I
arXiv:2108.06115
Abstract
We prove that planar graphs of maximum degree 3 and of girth at least 7 are 3-edge-colorable, extending the previous result for girth at least 8 by Kronk, Radlowski, and Franen from 1974.
arXiv comment7 pages plus 6 pages of annex; 11 figures