On Tue, 20 Apr 2004, Christian Ridderström wrote: > It looks like S_1 \oplus S_2 means the direct product/sum of the sets S_1 > and S_2, i.e. elements in S_1 \oplus S_2 are members of the set > > { (x,y) : x \in S_1, y \in S_2 }
> http://mathworld.wolfram.com/DirectProduct.html Christian, I've encountered the Wolfram site before. Yes, one should be more of a mathematician than I am to easily read and understand what they provide. Related to this is a tendency for academicians to assume that everyone reading what they write (or listening to them speak) is as knowledgeable as they are in the subject being discussed. When one leaves the Ivory Tower for the real world it quickly becomes apparent that decisions are made by non-technical folks. Those who cannot clearly communicate complex technical issues to this audience fall by the side of the road and never complete the journey. Or, they become geeks and SysAdmins. :-) Thanks, Rich -- Dr. Richard B. Shepard, President Applied Ecosystem Services, Inc. (TM) <http://www.appl-ecosys.com>