Christopher Browne <cbbrowne / acm.org> writes: > Anyone that has studied abstract algebra _won't_ be overly confused by > this, as the first entry into group theory will leap you into addition > systems that don't work the way you used to expect. Really? I have been doing abstract algebra and algebraic geometry for something like six or seven years, and I have _never_ seen anyone use the symbol '+' to denote a non-commutative operation ... -- Tord Romstad