Tag Archives: Mathoverflow

Test Your Intuition 40: What Are We Celebrating on Sept, 28, 2019? (And answer to TYI39.)

Posted on September 28, 2019 by Gil Kalai

Update: We are celebrating 10 years anniversary to Mathoverflow Domotorp got the answer right. congratulations, Domotorp! To all our readers: Shana Tova Umetuka –  שנה טובה ומתוקה – Happy and sweet (Jewish) new year.

Posted in Test your intuition, What is Mathematics | Tagged , | 6 Comments

Important formulas in Combinatorics

Posted on August 25, 2015 by Gil Kalai

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 Gil Kalai

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

Joe’s 100th MO question

Posted on July 12, 2011 by Gil Kalai

MathOverflow is a remarkable recent platform for research level questions and answers in mathematics. Joe O’Rourke have asked over MO wonderful questions. (Here is a link to the questions) Many of those questions can be the starting point of a research … Continue reading →

Posted in Mathematics over the Internet, Open problems | Tagged , , | 5 Comments

The AC0 Prime Number Conjecture

Posted on February 21, 2011 by Gil Kalai

Möbius randomness and computational complexity Last spring Peter Sarnak gave a thought-provoking lecture in Jerusalem. (Here are the very interesting slides of a similar lecture at I.A.S.) Here is a variation of the type of questions Peter has raised. The Prime … Continue reading →

Posted in Computer Science and Optimization, Number theory | Tagged , , , , , , , | 17 Comments

False Beliefs in Mathematics

Posted on June 6, 2010 by Gil Kalai

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

Randomness in Nature

Posted on December 27, 2009 by Gil Kalai

Here is an excellent question asked by Liza on “Mathoverflow“. What is the explanation of the apparent randomness of high-level phenomena in nature? For example the distribution of females vs. males in a population (I am referring to randomness in terms … Continue reading →

Posted in Probability | Tagged , , , , | 23 Comments

Math Overflow

Posted on November 12, 2009 by Gil Kalai

So I did try mathoverflow a bit and it is a cool site. Over the few days I spent there I gained 593 reputation points, and no less than 9 bronze badges. The first answer I proposed gave me a badge as “teacher”,  … Continue reading →

Posted in Blogging, Mathematics over the Internet | Tagged | 10 Comments