### This Week’s Finds in Mathematical Physics (Week 279)

#### Posted by John Baez

In week279 of This Week’s Finds, hear how we can describe vectors and spinors in 3d, 4d, 6d and 10d spacetime using the real numbers, complex numbers, quaternions and octonions.

See the magic identity that makes super-Yang-Mills theory and the classical superstring possible in these dimensions! Read the history of this subject… and then a bit about tuning systems and infinitely groupoidified logic.

Posted at September 6, 2009 2:01 AM UTC