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McDiarmid, Colin


Graph Theory » Coloring » Vertex coloring

2-colouring a graph without a monochromatic maximum clique ★★

Author(s): Hoang; McDiarmid

Conjecture   If $ G $ is a non-empty graph containing no induced odd cycle of length at least $ 5 $, then there is a $ 2 $-vertex colouring of $ G $ in which no maximum clique is monochromatic.

Keywords: maximum clique; Partitioning

Posted by Jon Noel
updated August 25th, 2013
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Graph Theory » Directed Graphs

Arc-disjoint directed cycles in regular directed graphs ★★

Author(s): Alon; McDiarmid; Molloy

Conjecture   If $ G $ is a $ k $-regular directed graph with no parallel arcs, then $ G $ contains a collection of $ {k+1 \choose 2} $ arc-disjoint directed cycles.

Keywords:

Posted by fhavet
updated May 17th, 2013
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Graph Theory » Coloring » Vertex coloring

Weighted colouring of hexagonal graphs. ★★

Author(s): McDiarmid; Reed

Conjecture   There is an absolute constant $ c $ such that for every hexagonal graph $ G $ and vertex weighting $ p:V(G)\rightarrow \mathbb{N} $, $$\chi(G,p) \leq \frac{9}{8}\omega(G,p) + c $$

Keywords:

Posted by fhavet
updated March 13th, 2013
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