Resend: [math-fun] Kaplansky's Obituary

[N.B. The last link wasn't clickable since it glommed on to the right angle bracket. I hope this one works.] I don't think I saw any mention of it here, but Kaplansky passed away little over one month ago, on June 25. Here's a link to a nice obituary . . . but I wasn't able to extract specific results of his from this: http://www.signonsandiego.com/uniontrib/20060714/news_1m14kaplansk.html Actually, I'm curious -- if any cognoscenti would care to explain some theorems he's famous for, I'd be very interested. --Dan