All of the conjectures mentioned here were disproved by Vincent Cohen-Addad, Michael Hebdige, Daniel Kral, Zhentao Li and Esteban Salgado. See https://arxiv.org/abs/1604.05108 .
Steinberg Conjecture disproved
All of the conjectures mentioned here were disproved by Vincent Cohen-Addad, Michael Hebdige, Daniel Kral, Zhentao Li and Esteban Salgado. See https://arxiv.org/abs/1604.05108 .