### This Week’s Finds in Mathematical Physics (Week 297)

#### Posted by John Baez

In week297 of This Week’s Finds, see some knot sculptures by Karel Vreeburg:

Read about special relativity in finance. Learn about lazulinos. Admire some peculiar infinite sums. Ponder a marvelous property of the number 12. Then: learn about the role of Dirichlet forms in electrical circuit theory!

Posted at May 10, 2010 4:38 AM UTC
## Re: This Week’s Finds in Mathematical Physics (Week 297)

You mentioned the

First, there’s a missing ‘o’. Second, is this the same as the Barratt-Priddy-Quillen-Segal theorem? Third, what precisely does it say?

Is there a place where you can find stored the group cohomology of $S_n$?