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math.CO2022
Coloring circle arrangements: New -chromatic planar graphs
Man-Kwun Chiu, Stefan Felsner, Manfred Scheucher +3
Felsner, Hurtado, Noy and Streinu (2000) conjectured that arrangement graphs of simple great-circle arrangements have chromatic number at most . Motivated by this conjecture, we…
math.CO2019★ 1 cited
The Number of Convex Polyominoes with Given Height and Width
Kevin Buchin, Man-Kwun Chiu, Stefan Felsner +2
We give a new combinatorial proof for the number of convex polyominoes whose minimum enclosing rectangle has given dimensions. We also count the subclass of these polyominoes that…