Links:

• Casson's three lectures on Casson handles: I include a book scan here since this may be hard to find. Casson's Three Lectures 

Fun: Here is a fun problem to stump your friends with.

• Is 2^n root(2) mod 1 dense in [0,1]?

Miscellaneous writing: 

• Exponential families (and the Gaussian dist.) are determined by a few points. 

• Verification of some details in Schwarz' original proof of the BIC