Graph Theory » Coloring » Vertex coloring

Circular coloring triangle-free subcubic planar graphs ★★

Author(s): Ghebleh; Zhu

Problem   Does every triangle-free planar graph of maximum degree three have circular chromatic number at most $ \frac{20}{7} $?

Keywords: circular coloring; planar graph; triangle free

Posted by mdevos
updated June 20th, 2007
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Geometry » Polytopes

Decomposing the truncated octahedron into parallelepipeds ★

Author(s):

Question   Can the truncated octahedron be decomposed into parallelepipeds?

Keywords: decomposition; lattice; parallelepiped

Posted by mdevos
updated June 20th, 2007
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RSS feeds

What is this? RSS is a standardized file format which is output by numerous websites including many news sites, weblogs, and the Garden. Programs called readers pick up these RSS feeds and display them.

What's the point? If there are many websites you are interested in getting information from, a reader can pick up the new information from all of them and display it for you, thus saving you the hassle of navigating everywhere to check for updates.

How do you use them? Simply choose a reader (for instance Google Reader) and then pick the websites you want to see.

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