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== Note on anonymous editing ==
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{{RightTOC}}
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This is the wiki for ''polymath'' projects - massively collaborative online mathematical projects.  The idea of such projects originated in Tim Gowers' blog post [http://gowers.wordpress.com/2009/01/27/is-massively-collaborative-mathematics-possible/ Is massively collaborative mathematics possible?]
  
Per the [[Talk:Main_Page|talk page]], anonymous editing has recently been disabled to help combat spam.  If this is causing problems, please leave a comment on the [[Talk:Main_Page|talk page]].
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Many polymath projects will be proposed, planned, and run at [http://polymathprojects.org/ This Blog].
  
== The Problem ==
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A Polymath [[logo]] is being trialled.  If you have more suggestions, please add them to the [[logo]] page, or add to the discussion at [[Talk:logo]].
  
Initially, the basic problem to be considered by the Polymath1 project was to explore a particular [http://gowers.wordpress.com/2009/02/01/a-combinatorial-approach-to-density-hales-jewett/ combinatorial approach] to the [[density Hales-Jewett theorem]] for k=3 (DHJ(3)), suggested by Tim Gowers.  The [[Furstenberg-Katznelson argument|original proof of DHJ(3) used arguments from ergodic theory]]. Fairly soon, the scope of the project expanded and forkedTwo projects emerged. The first project, "New Proof", had as its aim that of discovering any combinatorial argument for the theorem. The second project, "Low Dimensions", aimed to calculate precise bounds on density Hales-Jewett numbers and [[Moser's cube problem|Moser numbers]] for low dimensions n = 3, 4, 5, 6, 7, etc.  Both projects appear to have been successful, and are in the writing-up stage.
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The wiki is currently locked down due to a major influx of spam (July 29, 2013).  Please email mn@michaelnielsen.org if you'd like an account set up, and I'll do my best to reply quickly.  
  
==Write-up repositories==
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== Existing polymath projects ==
  
[[TeX files for first paper|Write-up page for the "New Proof" project]].  The most recent draft is [http://www.cs.cmu.edu/~odonnell/dhj-june-25.pdf here], tentatively titled "A new proof of the density Hales-Jewett theorem".
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* [[Polymath1]]: New proofs and bounds for the density Hales-Jewett theorem.  Initiated Feb 1, 2009; research results have now been published.
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* [[Definable Banach Spaces|Polymath2]]: Must an “explicitly defined” Banach space contain <math>c_0</math> or <math>l_p</math>?  Initiated Feb 17, 2009; attempts to relaunch via wiki, June 9 2010.
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* [[imo 2009 q6|Mini-polymath1]]: Solving Problem 6 of the 2009 International Mathematical Olympiad.  Initiated July 20, 2009; five proofs obtained so far.
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* [[The polynomial Hirsch conjecture|Polymath3]].  The polynomial Hirsch conjecture.  Proposed July 17, 2009; launched, September 30, 2010. 
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* [[finding primes|Polymath4]]: A deterministic way to find primes.  Proposed July 27, 2009; launched Aug 9, 2009.  Research results have now been published.
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* [[The Erd&#337;s discrepancy problem|Polymath5]]: The Erd&#337;s discrepancy problem. Proposed Jan 10, 2010; launched Jan 19, 2010.  Activity ceased by the end of 2012, but results from the project were used to solve the problem in 2015.
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* [[imo 2010|Mini-polymath2]]: Solving Problem 5 the 2010 International Mathematical OlympiadProposed Jun 12, 2010; launched and solved, Jul 8 2010.
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* [[Improving the bounds for Roth's theorem|Polymath6]]: Improving the bounds for Roth's theorem. Proposed Feb 5, 2011.
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* [[imo 2011|Mini-polymath3]]: Solving a problem from the 2011 International Mathematical Olympiad.  Proposed Jun 9, 2011; launched and solved, Jul 19, 2011.
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* [[imo 2012|Mini-polymath4]]: Solving a problem from the 2012 International Mathematical Olympiad.  Proposed, Jun 3, 2012; launched, July 12 2012.
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* [[The hot spots conjecture|Polymath7]]:  Establishing the Hot Spots conjecture for acute-angled triangles.  Proposed, May 31st, 2012; launched, Jun 8, 2012.
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* [[Bounded gaps between primes|Polymath8]]: Improving the bounds for small gaps between primes. Proposed, June 4, 2013; launched, June 4, 2013. Research results have now been published.
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* [[Discretized Borel Determinacy and P=NP|Polymath9]]: exploring Borel determinacy-based methods for giving complexity bounds.  Proposed, Oct 24, 2013; launched, Nov 3, 2013.
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* [[The Erdos-Rado sunflower lemma|Polymath10]]: improving the bounds for the Erdos-Rado sunflower lemma. Launched, Nov 2, 2015.
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* [[Frankl's union-closed conjecture|Polymath11]]: proving Frankl's union-closed conjecture. Proposed Jan 21, 2016; launched Jan 29, 2016.  Concluded, Jan 17, 2017.
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* [[Rota's conjecture|Polymath12]]: proving Rota's conjecture.  Proposed Feb 28, 2017.
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* [[Intransitive dice|Polymath13]]: Intransitive dice.  Proposed Apr 28, 2017.
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* [[linear norm|Polymath14]]: Classifying homogeneous norms on groups.  Initiated Dec 16, 2017; solved Dec 21, 2017.  Research results have now been published.
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* [[De_Bruijn-Newman constant|Polymath15]]: Upper bounding the de Bruin-Newman constant.  Proposed, Jan 24 2018; launched Jan 27 2018.
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* [[Hadwiger-Nelson problem|Polymath16]]: Simplifying the lower bound proof for the Hadwiger-Nelson problem.  Proposed, Apr 10, 2018; launched, Apr 14, 2018.
  
[[outline of second paper|Write-up page for the "Low Dimensions" project]]. The most recent draft is [http://terrytao.files.wordpress.com/2009/06/polymath2.pdf perhaps here], tentatively titled "Density Hales-Jewett and Moser numbers in low dimensions".
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== Polymath-like projects ==
  
==Basic definitions==
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* Scott Aaronson's "philomath project": "[http://scottaaronson.com/blog/?p=453 Sensitivity vs. Block sensitivity]" (see also [http://mathoverflow.net/questions/31482/the-sensitivity-of-2-colorings-of-the-d-dimensional-integer-lattice this Math Overflow question]).  Launched Jul 13, 2010.
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* A wiki page clearinghouse for the [[Deolalikar P vs NP paper]].  Launched Aug 10, 2010.
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* <del>[http://researchtrends.wikia.com/wiki/Main_Page Math Research Trends Wiki] "research in the middle"</del> This project is recommended to be discontinued in favor of <b>[https://conference.portonvictor.org/wiki/Research_in_the_middle Research in the middle project] at [https://conference.portonvictor.org Virtual scientific conference]</b>.
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* The page for the [[ABC conjecture]] contains links and information about Mochizuki's claimed proof of this conjecture.
  
*[[line|Algebraic line]]
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== Proposed polymath projects ==
  
*[[line|Combinatorial line]]
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* [http://gilkalai.wordpress.com/2009/03/25/an-open-discussion-and-polls-around-roths-theorem/ The cap set problem].  Proposed March 25, 2009 (see also these [http://gilkalai.wordpress.com/2009/05/11/around-the-cap-set-problem-b/ two] [http://gilkalai.wordpress.com/2009/05/18/the-cap-set-problem-and-frankl-rodl-theorem-c/ followup] posts).
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* [[Boshernitzan’s problem]].  Proposed July 27, 2009.
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* [http://gowers.wordpress.com/2009/09/16/possible-future-polymath-projects/ Possible future polymath projects].  Discussion opened September 16, 2009.
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* [http://rjlipton.wordpress.com/2011/05/12/a-possible-polymath-project/ A possible polymath project:] Proposal by Richard Lipton to attack a conjecture due to Erdos, about a class of Diophantine equations.
  
*[[Combinatorial subspace]]
 
  
*[[corners|Corner]]
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A (partial) list of proposed projects can be found [http://polymathprojects.org/category/polymath-proposals/ here].
  
*[[Density]]
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If you have a tentative proposal for a polymath project, you can either make a post on it on your own blog, or place it [[other proposed projects|here]].
  
*[[line|Geometric line]]
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== Discussions about polymath ==
  
*[[Slice]]
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* [http://gowers.wordpress.com/2009/01/27/is-massively-collaborative-mathematics-possible/ Is massively collaborative mathematics possible?] Tim Gowers, January 27, 2009.
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* [http://lucatrevisan.wordpress.com/2009/02/01/a-peoples-history-of-mathematics/ A people's history of mathematics] Luca Trevisan, February 1, 2009.
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* [http://michaelnielsen.org/blog/?p=553 The polymath project] Michael Nielsen, February 3, 2009.
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* [http://www.neverendingbooks.org/index.php/yet-another-math20-proposal.html Yet another math 2.0 proposal] Lieven le Bruyn, February 11, 2009.
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* [http://gowers.wordpress.com/2009/03/10/polymath1-and-open-collaborative-mathematics/ Polymath1 and open collaborative mathematics] Tim Gowers, March 10, 2009.
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* [http://maxwelldemon.com/2009/03/14/polymath/ Polymath] Edmund Harriss, March 14, 2009.
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* [http://science.slashdot.org/article.pl?sid=09/03/18/194228 Massive open collaboration in mathematics declared a success] Slashdot, March 18, 2009.
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* [http://michaelnielsen.org/blog/?p=581 How changing the technology of collaboration can change the nature of collaboration] Michael Nielsen, March 18, 2009.
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* [http://michaelnielsen.org/blog/?p=584 The polymath project: scope of participation] Michael Nielsen, March 20, 2009.
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* [http://gowers.wordpress.com/2009/03/24/can-polymath-be-scaled-up/ Can polymath be scaled up?] Tim Gowers, March 24, 2009.
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* [http://whatisresearch.wordpress.com/2009/03/24/concluding-notes-on-the-polymath-project-and-a-challenge/ Concluding notes on the polymath project - and a challenge] Vilpulniak, March 24, 2009.
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* [http://michaelnielsen.org/blog/on-scaling-up-the-polymath-project/ On scaling up the polymath project] Michael Nielsen, March 25, 2009.
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* [http://numberwarrior.wordpress.com/2009/03/25/a-gentle-introduction-to-the-polymath-project/ A gentle introduction to the polymath project] Jason Dyer, March 25, 2009.
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* [http://blogs.telegraph.co.uk/technology/iandouglas/9656357/tim_gowers_and_the_polymaths/ Tim Gowers and the polymaths] Ian Douglas (the Telegraph), April 29, 2009
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* [http://terrytao.wordpress.com/2009/07/22/imo-2009-q6-mini-polymath-project-impressions-reflections-analysis/ IMO 2009 Q6 as mini-polymath project: impressions, reflections, analysis] Terence Tao, July 22, 2009.
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* [http://polymathprojects.org/2009/07/27/selecting-the-next-polymath-project/ Selecting the next polymath project] Terence Tao, July 27, 2009.
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* [http://blog.jonudell.net/2009/07/31/polymath-equals-user-innovatio/ Polymath equals user innovation] Jon Udell, July 31, 2009.
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* [http://scienceblogs.com/christinaslisrant/2009/08/an_overview_of_the_polymath_pr.php An overview of the polymath project] Christina Pikas, August 1, 2009
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* [http://whatisresearch.wordpress.com/2009/08/09/collaborative-mathematics-etc/ Collaborative mathematics etc.] Vipulniak, August 9, 2009
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* [http://www.nature.com/nature/journal/v461/n7266/full/461879a.html Massively collaborative mathematics] Tim Gowers, Michael Nielsen, Nature, October 15, 2009
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* [http://portonmath.wordpress.com/2009/10/25/collaborative-research-of-filters/ Collaborative math research – a real example] Victor Porton, October 24, 2009
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* [http://whatisresearch.wordpress.com/2009/10/26/polymath-again/ Polymath again] Vipulniak, October 26, 2009
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* [http://www.kennislink.nl/publicaties/wiskunde-met-zijn-allen Wiskunde met zijn allen] (Dutch), Alex van den Brandhof, Kennislink, November 12, 2009
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* [http://www.sciencenews.org/view/generic/id/50532/title/Mathematics_by_collaboration Mathematics by collaboration], Julie Rehmeyer, ScienceNews, December 8, 2009
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* [http://www.nytimes.com/projects/magazine/ideas/2009/#m Massively Collaborative Mathematics], Jordan Ellenberg, The Ninth Annual Year in Ideas, New York Times, 2009.
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* [http://www.hypios.com/thinking/2010/01/13/massively-collaborative-mathematics-lessons-from-polymath1/ Massively Collaborative Mathematics: lessons from polymath1], Hypios, Jan 13 2010
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* [http://ths1104.wordpress.com/2010/02/13/open-reflexions-sur-fond-de-polymaths/ Open réflexions sur fond de Polymaths] (French), ths1104, Feb 13 2010
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* [http://www.javiertordable.com/blog/2010/02/25/collaborative-mathematics-future-of-science Collaborative Mathematics and The Future of Science] Javier Tordable, February 26 2010
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* [http://www.scientificamerican.com/article.cfm?id=problem-solved-tic-tac-toe-blog Problem Solved, LOL: A Complex Tic-Tac-Toe Puzzle Falls Thanks to Blog Comments] Davide Castelvecchi, Scientific American, March 17 2010
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* [http://www.thebigquestions.com/2010/04/08/blogging-tic-tac-toe-and-the-future-of-math/ Blogging, Tic Tac Toe, and the Future of Math] Steve Landsburg, The Big Questions, April 4 2010
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* [http://www.siam.org/news/news.php?issue=0043.03 Massively Collaborative Mathematics] Julie Rehmeyer, SIAM News, Volume 43(3), April 2010 (to appear)
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* [http://mbarany.com/publications.html#WikiSymPolymath  `But this is blog maths and we're free to make up conventions as we go along': Polymath1 and the Modalities of `Massively Collaborative Mathematics.'] Michael Barany,  Proceedings of the 6th International Symposium on Wikis and Open Collaboration, Gdansk, Poland, 2010.
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* [http://www.cs.cmu.edu/~jcransh/papers/cranshaw_kittur.pdf J. Cranshaw and A. Kittur. The Polymath Project: Lessons from a successful online collaboration in mathematics]. In Proceedings of the Conference on Human Factors in Computing Systems, Vancouver, BC, Canada, May 2011.
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* [http://www.newscientist.com/article/mg21028113.900-how-to-build-the-global-mathematics-brain.html How to build the global mathematics brain], Jacob Aron, New Scientist, 4 May 2011.
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* [http://www.newscientist.com/article/mg21028112.900-mathematics-becomes-more-sociable.html Mathematics becomes more sociable], New Scientist, 5 May 2011.
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* [http://polymathprojects.files.wordpress.com/2011/03/polymathias.jpg Mathematical Advances: Lone or Massively Collaborative Endeavors?] from IAS Institute Letter for fall 2010 based on a discussion organized by IAS fall 2010.
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* [http://today.uconn.edu/blog/2010/10/will-crowdsourcing-revolutionize-scholarship Will ‘Crowdsourcing’ Revolutionize Scholarship?] An article in UConn Today by Jeremy Teitelbaum, Fall 2010.
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* [http://online.wsj.com/article/SB10001424052970204644504576653573191370088.html The New Einsteins Will Be Scientists Who Share] The Wall street journal, October 2011.
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* [http://www.nature.com/news/parallel-lines-1.14759?WT.ec_id=NATURE-20140227 Parallel lines], editorial, Nature 506, 407–408 (27 February 2014).
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Additional links are very welcome.
  
== Useful background materials ==
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== Other links ==
  
Here is [http://gowers.wordpress.com/2009/01/30/background-to-a-polymath-project/ some background to the project.] There is also a [http://gowers.wordpress.com/2009/01/27/is-massively-collaborative-mathematics-possible/ general discussion on massively collaborative "polymath" projects.] This is  [http://meta.wikimedia.org/wiki/File:MediaWikiRefCard.png  a cheatsheet for editing the wiki.]  Here is a [http://michaelnielsen.org/blog/?p=582 python script] which can help convert sizeable chunks of LaTeX into wiki-tex.  Finally, here is the general [http://meta.wikimedia.org/wiki/Help:Contents Wiki user's guide].
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* [http://polymathprojects.org/ The polymath blog]
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* [http://polymathprojects.org/general-polymath-rules/ General polymath rules]
  
== Threads and further problems==
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== Note on anonymous editing ==
 
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* [http://gowers.wordpress.com/2009/01/27/is-massively-collaborative-mathematics-possible/ Is massively collaborative mathematics possible?] (inactive)
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* (1-199) [http://gowers.wordpress.com/2009/02/01/a-combinatorial-approach-to-density-hales-jewett/ A combinatorial approach to density Hales-Jewett] (inactive)
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* (200-299) [http://terrytao.wordpress.com/2009/02/05/upper-and-lower-bounds-for-the-density-hales-jewett-problem/ Upper and lower bounds for the density Hales-Jewett problem] (inactive)
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* (300-399) [http://gowers.wordpress.com/2009/02/06/dhj-the-triangle-removal-approach/ The triangle-removal approach] (inactive)
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* (400-499) [http://gowers.wordpress.com/2009/02/08/dhj-quasirandomness-and-obstructions-to-uniformity Quasirandomness and obstructions to uniformity] (inactive)
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* (500-599) [http://gowers.wordpress.com/2009/02/13/dhj-possible-proof-strategies/#more-441/ Possible proof strategies] (inactive)
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* (600-699) [http://terrytao.wordpress.com/2009/02/11/a-reading-seminar-on-density-hales-jewett/ A reading seminar on density Hales-Jewett] (inactive)
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* (700-799) [http://terrytao.wordpress.com/2009/02/13/bounds-for-the-first-few-density-hales-jewett-numbers-and-related-quantities/ Bounds for the first few density Hales-Jewett numbers, and related quantities] (inactive)
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* (800-849) [http://gowers.wordpress.com/2009/02/23/brief-review-of-polymath1/ Brief review of polymath1] (inactive)
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* (850-899) [http://gowers.wordpress.com/2009/03/02/dhj3-851-899/ DHJ(3): 851-899] (inactive)
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* (900-999) [http://terrytao.wordpress.com/2009/03/04/dhj3-900-999-density-hales-jewett-type-numbers/ DHJ(3): 900-999 (Density Hales-Jewett type numbers)] (inactive)
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* (1000-1049) [http://gowers.wordpress.com/2009/03/10/problem-solved-probably/ Problem solved (probably)] (inactive)
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* [http://gowers.wordpress.com/2009/03/10/polymath1-and-open-collaborative-mathematics/ Polymath1 and open collaborative mathematics] (inactive)
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* (1050-1099) [http://gowers.wordpress.com/2009/03/16/dhj3-and-related-results-1050-1099/ DHJ(3) and related results: 1050-1099] (inactive)
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* (1100-1199) [http://terrytao.wordpress.com/2009/03/14/dhj3-1100-1199-density-hales-jewett-type-numbers/ DHJ(3): 1100-1199 (Density Hales-Jewett type numbers)] (inactive)
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*(discussion) [http://gilkalai.wordpress.com/2009/03/25/an-open-discussion-and-polls-around-roths-theorem/ An Open Discussion and Polls: Around Roth’s Theorem] (inactive)
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* (1200-1299) [http://terrytao.wordpress.com/2009/03/30/dhjk-1200-1299-density-hales-jewett-type-numbers/ DHJ(k): 1200-1299 (Density Hales-Jewett type numbers)] (inactive)
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* [http://terrytao.wordpress.com/2009/05/22/dhj-writing-the-second-paper/ DHJ: writing the second paper] (inactive)
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* [http://terrytao.wordpress.com/2009/06/14/dhj-still-writing-the-second-paper/ DHJ: still writing the second paper] ('''active''')
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* [http://gowers.wordpress.com/2009/06/25/dhj-write-up-and-other-matters/ DHJ write-up and other matters] ('''active''')
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[http://blogsearch.google.com/blogsearch?hl=en&ie=UTF-8&q=polymath1&btnG=Search+Blogs Here is a further list of blog posts related to the Polymath1 project].  [http://en.wordpress.com/tag/polymath1/ Here is wordpress's list].
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A spreadsheet containing the latest upper and lower bounds for <math>c_n</math> can be found [http://spreadsheets.google.com/ccc?key=p5T0SktZY9DsU-uZ1tK7VEg here].  Here are the proofs of our [[upper and lower bounds]] for these constants, as well as the [[higher-dimensional DHJ numbers|counterparts for higher k]].
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We are also collecting bounds for [[Fujimura's problem]], motivated by a [[hyper-optimistic conjecture]]. We are additionally investigating [[higher-dimensional Fujimura]].
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There is also a chance that we will be able to improve the known bounds on [[Moser's cube problem]] or the [[Kakeya problem]].
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Here are some [[unsolved problems]] arising from the above threads.
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Here is a [[tidy problem page]].
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== Proof strategies ==
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It is natural to look for strategies based on one of the following:
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* [[Szemerédi's original proof of Szemerédi's theorem]].
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* [[Szemerédi's combinatorial proof of Roth's theorem]].
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* [[Ajtai-Szemerédi's proof of the corners theorem]].
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* The [[density increment method]].
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* The [[triangle removal lemma]].
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* [[Ergodic-inspired methods]].
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* The [[Furstenberg-Katznelson argument]].
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* Use of [[equal-slices measure]].
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== Related theorems ==
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* [[Carlson's theorem]].
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* The [[Carlson-Simpson theorem]].
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* [[Folkman's theorem]].
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* The [[Graham-Rothschild theorem]].
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* The colouring [[Hales-Jewett theorem]].
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* The [[Kruskal-Katona theorem]].
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* [[Roth's theorem]].
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* The [[IP-Szemer&eacute;di theorem]].
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* [[Sperner's theorem]].
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* [[Szemer&eacute;di's regularity lemma]].
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* [[Szemer&eacute;di's theorem]].
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* The [[triangle removal lemma]].
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All these theorems are worth knowing. The most immediately relevant are Roth's theorem, Sperner's theorem, Szemer&eacute;di's regularity lemma and the triangle removal lemma, but some of the others could well come into play as well.
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==Important concepts related to possible proofs==
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* [[Complexity of a set]]
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* [[Concentration of measure]]
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* [[Influence of variables]]
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* [[Obstructions to uniformity]]
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* [[Quasirandomness]]
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==Complete proofs or detailed sketches of potentially useful results==
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*[[Sperner's theorem|The multidimensional Sperner theorem]]
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*[[Line-free sets correlate locally with complexity-1 sets]]
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*[[Correlation with a 1-set implies correlation with a subspace]] (Superseded)
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*[[Fourier-analytic_proof_of_Sperner|A Fourier-analytic proof of Sperner's theorem]]
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*[[A second Fourier decomposition related to Sperner's theorem]]
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*[[A Hilbert space lemma]]
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*A [[Modification of the Ajtai-Szemer&eacute;di argument]]
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*An [[abstract regularity lemma]]
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*[[A general result about density increments]]
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==Attempts at proofs of DHJ(3)==
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*[[An outline of a density-increment argument]] (ultimately didn't work)
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*[[A second outline of a density-increment argument]] (seems to be OK but more checking needed)
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*[[Proof of DHJ(3) via density-increment|Another outline of the whole argument]] (attempts to be more detailed)
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*[[Furstenberg-Katznelson argument]] (very sketchy)
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*[[Austin's proof]] (very sketchy)
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*[[Austin's proof II]] (mostly complete, though more explanation and motivation needed)
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*A [[timeline]] of some of the progress on the "New Proof" project.
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==Generalizing to DHJ(k)==
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*[[DHJ(k) implies multidimensional DHJ(k)]]
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*[[Line free sets correlate locally with dense sets of complexity k-2]]
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*[[A general partitioning principle]]
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== Bibliography ==
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Here is a [[Bibliography]] of relevant papers in the field.
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== How to help out ==
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There are a number of ways that even casual participants can help contribute to the Polymath1 project:
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* Expand the [[bibliography]]
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* Join the [http://gowers.wordpress.com/2009/03/10/polymath1-and-open-collaborative-mathematics metadiscussion thread]
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* Join the [http://gilkalai.wordpress.com/2009/03/25/an-open-discussion-and-polls-around-roths-theorem open discussion] thread (about these mathematical problems; not about the open collaboration), and participate in the polls.
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* Add some more Ramsey theorems to this wiki; one could hope to flesh out this wiki into a Ramsey theory resource at some point.
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* Suggest a logo for this wiki!
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* Suggest a way to speed up our [[genetic algorithm]]
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* Point out places where the exposition could be improved
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* Jump in to the technical discussion; find some nice new angles to the discussed problems.
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* Add to this list
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== End notes ==
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To help combat spam, anonymous editing has been disabled, and a captcha system added to hinder automated account creation. If this is causing problems, please email mn@michaelnielsen.org.
  
[["New Proof" grant acknowledgments]]
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== Note on image uploads ==
  
[["Low Dimensions" grant acknowledgments]]
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Image uploads have been disabled, as they were causing problems with spam.  If you'd like to upload an image, please email mn@michaelnielsen.org

Latest revision as of 11:10, 27 November 2018

This is the wiki for polymath projects - massively collaborative online mathematical projects. The idea of such projects originated in Tim Gowers' blog post Is massively collaborative mathematics possible?

Many polymath projects will be proposed, planned, and run at This Blog.

A Polymath logo is being trialled. If you have more suggestions, please add them to the logo page, or add to the discussion at Talk:logo.

The wiki is currently locked down due to a major influx of spam (July 29, 2013). Please email mn@michaelnielsen.org if you'd like an account set up, and I'll do my best to reply quickly.

Existing polymath projects

  • Polymath1: New proofs and bounds for the density Hales-Jewett theorem. Initiated Feb 1, 2009; research results have now been published.
  • Polymath2: Must an “explicitly defined” Banach space contain [math]c_0[/math] or [math]l_p[/math]? Initiated Feb 17, 2009; attempts to relaunch via wiki, June 9 2010.
  • Mini-polymath1: Solving Problem 6 of the 2009 International Mathematical Olympiad. Initiated July 20, 2009; five proofs obtained so far.
  • Polymath3. The polynomial Hirsch conjecture. Proposed July 17, 2009; launched, September 30, 2010.
  • Polymath4: A deterministic way to find primes. Proposed July 27, 2009; launched Aug 9, 2009. Research results have now been published.
  • Polymath5: The Erdős discrepancy problem. Proposed Jan 10, 2010; launched Jan 19, 2010. Activity ceased by the end of 2012, but results from the project were used to solve the problem in 2015.
  • Mini-polymath2: Solving Problem 5 the 2010 International Mathematical Olympiad. Proposed Jun 12, 2010; launched and solved, Jul 8 2010.
  • Polymath6: Improving the bounds for Roth's theorem. Proposed Feb 5, 2011.
  • Mini-polymath3: Solving a problem from the 2011 International Mathematical Olympiad. Proposed Jun 9, 2011; launched and solved, Jul 19, 2011.
  • Mini-polymath4: Solving a problem from the 2012 International Mathematical Olympiad. Proposed, Jun 3, 2012; launched, July 12 2012.
  • Polymath7: Establishing the Hot Spots conjecture for acute-angled triangles. Proposed, May 31st, 2012; launched, Jun 8, 2012.
  • Polymath8: Improving the bounds for small gaps between primes. Proposed, June 4, 2013; launched, June 4, 2013. Research results have now been published.
  • Polymath9: exploring Borel determinacy-based methods for giving complexity bounds. Proposed, Oct 24, 2013; launched, Nov 3, 2013.
  • Polymath10: improving the bounds for the Erdos-Rado sunflower lemma. Launched, Nov 2, 2015.
  • Polymath11: proving Frankl's union-closed conjecture. Proposed Jan 21, 2016; launched Jan 29, 2016. Concluded, Jan 17, 2017.
  • Polymath12: proving Rota's conjecture. Proposed Feb 28, 2017.
  • Polymath13: Intransitive dice. Proposed Apr 28, 2017.
  • Polymath14: Classifying homogeneous norms on groups. Initiated Dec 16, 2017; solved Dec 21, 2017. Research results have now been published.
  • Polymath15: Upper bounding the de Bruin-Newman constant. Proposed, Jan 24 2018; launched Jan 27 2018.
  • Polymath16: Simplifying the lower bound proof for the Hadwiger-Nelson problem. Proposed, Apr 10, 2018; launched, Apr 14, 2018.

Polymath-like projects

Proposed polymath projects


A (partial) list of proposed projects can be found here.

If you have a tentative proposal for a polymath project, you can either make a post on it on your own blog, or place it here.

Discussions about polymath

Additional links are very welcome.

Other links

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