« first day (133 days earlier)      last day (1284 days later) » 

5:47 AM
Q: When did Bourbaki stop writing books? A: When they realized that Serge Lang was a single person.
The joke is also mentioned in the Notices article on Serge Lang: ams.org/notices/200605/fea-lang.pdf
 

« first day (133 days earlier)      last day (1284 days later) »