All right, as we just learned, Britannica is done publishing. Wikipedia won. It wasn’t much of a contest, really. We all expected this a long time ago. Even if WP wasn’t as big as it is now (English language WP has about 4 mil pages), looking up there is noticeably faster than figuring out which volume of Britannica has your information. So should we celebrate or commiserate? I think neither, but we should instead turn this crisis into an opportunity.
First, how to think of the Britannica? I say, as a series of historical documents, written by some of the best writers and scientists. The case in point: Combinatorics article, which exists both in WP and in Britannica (the webpage has a free access this month). Let’s review:
1) The Britannica Combinatorics article is overly long and incomplete at the same time, somewhat biased, very out of date, and barely coherent. Lots of little examples are mentioned (multinomial coefficients, PBIB, etc.) and a few big things (graph theory, Ramsey theory, combinatorical geometry). Nothing remotely recent (like algebraic combinatorics), most references from the 1960s and a couple of 1980s textbooks which are “accessible to laymen” (a lovely turn of phrase). Sort of reminds me of this bridge - nice, useful in the past, but ultimately useless nowdays.
2) The Wikipedia Combinatorics article was in a horrible shape only about 3 years ago. As a big WP fan, I was upset over this, and over the 1998 winter break largely rewrote the page myself. The current version is still about 95% the same as I made it. Rather than give silly examples and historical discussions, I simply made it into a portal with wikilinks to relevant subfields and few sentences describing each. I thought I would get back to the article and write some more, but never did. Sorry!
So, what gives? Neither version is really a winner. The Britannica article is outdated. The WP article by itself has very little information. The real difference can be seen only by going along the links – the total scope and quality of WP articles in combinatorics is noticeably better. Still, some areas have WP pages which are not well written and/or have little information. In summary, neither article gives a picture of the field. If I were to choose a well written and accessible Combinatorics encyclopedia article, I would suggest Enumerative and Algebraic Combinatorics by Zeilberger, Extremal and Probabilistic Combinatorics by Alon and Krivelevich, and other articles from The Princeton Companion in Mathematics (Ed. by Tim Gowers).
On the other hand, if viewed as a historical document Britannica article has a number of hidden treasures. Written (at least in part) by Grünbaum (I am guessing in the 1960s), it correctly predicts the future growth of the extremal cominatorics and discrete geometry. It is off base when it come to some other areas, like Polya’s theory which is rarely taught now and viewed as old fashioned. Still, the page gives a window into the 1960 (or 1980?) thinking of what combinatorics is about. In fact, even the name of the article was different – until recently it was “Combinatorial Analysis”.
My favorite “hidden gem” is the section on Partition Theory. Check out theorem (F1) there, which has both the statement and the proof (!). This is common for WP (see e.g. this page), but rather unique for the Britannica. It so happens, this section was originally written by Percy MacMahon in the 1911 Britannica (which is out of copyright now). His version was up to date and beautifully written, later corrupted and shortened but never completely disappeared. In fact, compared to 1911, new mistakes were introduced, e.g. an unpleasant typo in the section title “The Ferrer diagram” which I noticed in the 1960 edition managed to survive all these decades (they are named after Norman Ferrers).
Finally, my modest suggestion. Treat the Britannica as a historical treasure that is up for sale (not unlike this one, sold in 1998). After all, it dates back to 1768, three times older than this “Historic Cultural Monument” in my neighborhood. The Britannica currently sells its digital version, but I bet this line of income will also dry up. We (the people) should simply buy the whole thing and make it free and publicly available on the web. Make sure to have available on the web all editions, not just the latest one. This would give an instant window of how the same subject was treated over time. Perhaps UNESCO? Google? Microsoft? (it’s better than your Encarta, really!) Amazon? NSF? Anyone with money? I bet it’s cheap…