Category Archives: Polymath10

Polymath10 conclusion

Posted on January 17, 2017 by Gil Kalai

The Polymath10 project on the Erdos-Rado Delta-System conjecture took place over this blog from November 2015 to May 2016. I aimed for an easy-going project that people could participate calmly aside from their main research efforts and  the duration of … Continue reading →

Posted in Combinatorics, Open problems, Polymath10 | Tagged , | 5 Comments

Polymath 10 post 6: The Erdos-Rado sunflower conjecture, and the Turan (4,3) problem: homological approaches.

Posted on May 27, 2016 by Gil Kalai

In earlier posts I proposed a homological approach to the Erdos-Rado sunflower conjecture.  I will describe again this approach in the second part of this post. Of course, discussion of other avenues for the study of the conjecture are welcome. The purpose … Continue reading →

Posted in Combinatorics, Mathematics over the Internet, Open problems, Polymath10 | Tagged , | 6 Comments

Polymath 10 Emergency Post 5: The Erdos-Szemeredi Sunflower Conjecture is Now Proven.

Posted on May 17, 2016 by Gil Kalai

While slowly writing Post 5 (now planned to be Post 6) of our polymath10 project on the Erdos-Rado sunflower conjecture, the very recent proof (see this post) that cap sets have  exponentially small density has changed matters greatly! It implies … Continue reading →

Posted in Combinatorics, Polymath10 | Tagged , , , | 36 Comments

Polymath10-post 4: Back to the drawing board?

Posted on January 31, 2016 by Gil Kalai

It is time for a new polymath10 post on the Erdos-Rado Sunflower Conjecture. (Here are the links for post1, post2, post3.) Let me summarize the discussion from Post 3 and we can discuss together what directions to peruse. It is … Continue reading →

Posted in Combinatorics, Mathematics over the Internet, Polymath10 | 12 Comments

News (mainly polymath related)

Posted on January 20, 2016 by Gil Kalai

Update (Jan 21) j) Polymath11 (?) Tim Gowers’s proposed a polymath project on Frankl’s conjecture. If it will get off the ground we will have (with polymath10) two projects running in parallel which is very nice. (In the comments Jon Awbrey gave … Continue reading →

Posted in Combinatorics, Conferences, Mathematics over the Internet, Polymath10, Polymath3, Updates | Tagged , , , , , , , , | 11 Comments

Polymath 10 Post 3: How are we doing?

Posted on December 8, 2015 by Gil Kalai

The main purpose of this post is to start a new research thread for Polymath 10  dealing with the Erdos-Rado Sunflower problem.  (Here are links to post 2 and post 1.) Here is a  very quick review of where we … Continue reading →

Posted in Combinatorics, Mathematics over the Internet, Open problems, Polymath10 | Tagged , | 104 Comments

Polymath10, Post 2: Homological Approach

Posted on November 11, 2015 by Gil Kalai

We launched polymath10 a week ago and it is time for the second post. In this post I will remind the readers what  the Erdos-Rado Conjecture and the Erdos-Rado theorem are,  briefly mention some points made in the previous post and in … Continue reading →

Posted in Combinatorics, Polymath10 | Tagged , , , | 126 Comments

Polymath10: The Erdos Rado Delta System Conjecture

Posted on November 3, 2015 by Gil Kalai

The purpose of this post is to start the polymath10 project. It is one of the nine projects (project 3d) proposed by Tim Gowers in his post “possible future polymath projects”. The plan is to attack Erdos-Rado delta system conjecture also known as the … Continue reading →

Posted in Combinatorics, Polymath10 | Tagged , , , | 141 Comments