Monthly Archives: October 2008

The Chromatic Number of Liechtenstein

Four colors suffice for any planar map: We’ve known that since 1977. If a map is divided into countries or provinces or other regions, and you want to color the map so that no two adjacent regions have the same … Continue reading

Posted in mathematics, problems and puzzles | 5 Comments

Net work

I’m afraid. I’m afraid, Dave. Dave, my mind is going. I can feel it. I can feel it. My mind is going. There is no question about it. I can feel it. I can feel it. I can feel it. … Continue reading

Posted in uncategorized | 3 Comments

The arity of equality

The symbol “=” is the fulcrum of a balance. It declares that the things on either side of it, whatever they may be, are equivalent, identical, alike, indistinguishable, the same. [*] The metaphor of the balance implies that exactly two … Continue reading

Posted in computing | 14 Comments


Lattice QCD is something I’ve been trying to understand for 30 years. My latest attempt is chronicled in the new issue of American Scientist. QCD is quantum chromodynamics, the theory of interactions between quarks and gluons. The lattice version of … Continue reading

Posted in physics | Comments Off

Survey on computing in the sciences

Do you create software for scientific computing, or use such software in doing research? Then my friend Greg Wilson would like to hear from you. Together with colleagues from the University of Toronto, Simula Research Laboratory and the National Research … Continue reading

Posted in computing, science | Comments Off

Demaine event

“Between The Folds” uncovers the stories of ten fine artists and intrepid theoretical scientists who abandoned careers and scoffed at hard-earned graduate degrees—all to forge unconventional lives as modern-day paperfolders. Perhaps such a film should be kept from impressionable youth, … Continue reading

Posted in mathematics | 2 Comments

Spam by the numbers

Reviewing this month’s batch of incoming junk mail, I stumbled upon the following message: In case that image is too tiny to read, here is the first word in source-code form: 28 47 34 74 33 85 42 16 43 … Continue reading

Posted in modern life, statistics | 12 Comments