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math.CO2026
Three-edge-coloring apex cubic graphs
Yuta Inoue, Ken-ichi Kawarabayashi, Rintaro Matsuo +3
A graph is \emph{apex} if has a vertex such that is planar. We prove that every -connected apex cubic graph is three-edge-colorable. This result gives the fina…
math.CO2026
The Four Color Theorem with Linearly Many Reducible Configurations and Near-Linear Time Coloring
Yuta Inoue, Ken-ichi Kawarabayashi, Atsuyuki Miyashita +3
We give a near-linear time 4-coloring algorithm for planar graphs, improving on the previous quadratic time algorithm by Robertson et al. from 1996. Such an algorithm cannot be ach…