Tag Archives: Mathoverflow

Important formulas in Combinatorics

Posted on August 25, 2015 by

Another spin-off of the Noga-poster-formula-competition is a MathOverflow question:  Important formulas in combinatorics. The question collects important formulas representing major progress in combinatorics. So far there are 31 formulas and quite a few were new to me. There are several areas … Continue reading →

Posted in Combinatorics | Tagged , | 2 Comments

Joel David Hamkins’ 1000th MO Answer is Coming

Posted on January 29, 2014 by

Updates (May 2014): The second MO contributor to answer 1000 questions is another distinguished mathematician (and a friend) Igor Rivin.  In summer 2015 David Speyer joined the club. (May 2018) Igor is the first MO user to have 2000 posts (Questions+Answers)! … Continue reading →

Posted in Mathematical logic and set theory, Mathematics over the Internet | Tagged , | 3 Comments

False Beliefs in Mathematics

Posted on June 6, 2010 by

Test your intuition: For two n by n matrices A and B, is it always the case that tr(ABAB) = tr(ABBA)?

Posted in Mathematics over the Internet, Test your intuition | Tagged , , | 6 Comments