The empty set according to bourbaki - the bourbaki code - http://www.neverendingbooks.org/the-empty-set-according-to-bo...
If this is completely obvious to you, stop reading now and start getting a life. For the rest of us, it took me quite some time before i was able to parse this formula, and when i finally did, it only added to my initial confusion. ‎- Скажи это моей лошади