The article is totally a rehash of Quillen's original paper, with a minor correction due to Keller. Improvements regarding its place in the larger scheme of things are the next step. There also seems to be a piece of history regarding this concept that Quillen mentions, which I haven't pursued. Perhaps the examples (which are basically due to me, though they do not rely on complicated deductions so I don't feel that they are really OR) could be replaced or augmented by published examples. A reference to a more standard text treating this (unfortunately, Gelfand–Manin doesn't) might be nice as well.
Ryan Reich 19:20, 24 May 2007 (UTC)
