When I was at U. Chicago, we would have a semiregular feature call the
Complexity Class of the Week where we would pick a complexity
class or other concept and on a white board in the lounge write the
definition, what was known, how it related to other classes and
perhaps most importantly what open questions remained.
I decided to
revive this tradition here on this virtual whiteboard in the ultimate
lounge known as the internet.
Scott Aaronson has set up a Complexity
Zoo that gives a short description of many classes that make a
good reference. We will go more in depth for a single class or concept
but Aaronson's site makes for a good reference for other classes we
mention.
Watch this space tomorrow for the first complexity class of the
week. Feel free to email me with suggestion for future classes of the
week, especially if you are willing to contribute a write-up.