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A090245 Maximum numbers of cards that would have no SET in an n-attribute version of the SET card game. 6
1, 2, 4, 9, 20, 45, 112 (list; graph; refs; listen; history; text; internal format)



Or, largest size of an n-dimensional capset (i.e., a subset of (Z/3Z)^n that does not contain any lines {a, a+r, a+2r}). - Terence Tao, Feb 20 2009

Or, size of maximal cap in the affine geometry AG(n+1,3). - N. J. A. Sloane, Oct 25 2014

It may only be a conjecture that the interpretation in terms of the SET game gives the same sequence for all n as the maximal cap problem. - N. J. A. Sloane, Oct 25 2014, following a conversation with James Abello.


Table of n, a(n) for n=0..6.

James Abello (DIMACS Institute, Rutgers University), The majority rule and combinatorial geometry (via the symmetric group), preprint, 2004.

Robert A. Bosch, ‘Set’less Collections of SET Cards, 2000.

Brink, D. V., 1997, The search for SET. [Dead link]

Benjamin Lent Davis and Diane Maclagan, The Card Game SET, The Mathematical Intelligencer, Vol. 25:3 (Summer 2003), pp. 33-40.

Yves Edel, Home page.

Jordan S. Ellenberg, Bounds for cap sets, Quomodocumque Blog, May 13 2016.

Jordan S. Ellenberg, Dion Gijswijt, On large subsets of F_q^n with no three-term arithmetic progression, arXiv:1605.09223 [math.CO], 2016.

Michael Follett, et al. Partitions of AG (4, 3) into Maximal Caps, Discrete Math., 337 (2014), 1-8. Preprint: arXiv:1302.4703 [math.CO].

Guardians of SET, SET Home Page.

B. Monjardet, Acyclic domains of linear orders: a survey, in "The Mathematics of Preference, Choice and Order: Essays in Honor of Peter Fishburn", edited by Steven Brams, William V. Gehrlein and Fred S. Roberts, Springer, 2009, pp. 139-160.

B. Monjardet, Acyclic domains of linear orders: a survey, 2006-83, Centre d’Economie de la Sorbonne, Cahier de la MSE, Paris, 2006.

Pierre Jalinière, Le jeu Set, Images des Mathématiques, CNRS, 2013.

Miriam Melnick, The Joy of SET, May 2011.

J. Peebles, Cap Set Bounds and Matrix Multiplication, Senior Thesis, Harvey Mudd College, 2013.

Ivars Peterson, SET Math.

Aaron Potechin, Maximal caps in AG(6, 3), Designs, Codes and Cryptography, Volume 46, Number 3, March 2008.

SET card game, Official web site.

Terence Tao, Bounds for the first few density Hales-Jewett numbers, and related quantities.

M. Zabrocki, The Joy of SET, 2001.


a(n) <= A003142(n).

Asymptotically, a(n) = O(3^n/n) and a(n) > (2.21...)^n. - Terence Tao, Feb 20 2009

Asymptotically, a(n) = o(2.756^n). - David Radcliffe, May 30 2016


Cf. A090246, A156989.

Sequence in context: A188460 A111099 A000632 * A274965 A006958 A036617

Adjacent sequences:  A090242 A090243 A090244 * A090246 A090247 A090248




Hans Havermann, Jan 23 2004


a(6) sent by Terence Tao, Feb 20 2009

Edited by N. J. A. Sloane, Feb 21 2009



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Last modified May 25 16:08 EDT 2017. Contains 287039 sequences.