## August 11, 2010

### This Week’s Finds in Mathematical Physics (Week 300)

#### Posted by John Baez

In the last issue of This Week’s Finds in Mathematical Physics, learn how to categorify the Riemann zeta function and get a groupoid whose cardinality is

$\zeta(2) = \frac{\pi^2}{6}$

Posted at August 11, 2010 1:55 PM UTC

TrackBack URL for this Entry:   http://golem.ph.utexas.edu/cgi-bin/MT-3.0/dxy-tb.fcgi/2256