- algorithm approximation art bar beauty binary binomial coefficients birthday book review Carnival of Mathematics chocolate combinatorics complex consecutive cookies counting decadic decimal diagrams divisibility double elements equivalence expansion factorization fibonacci finite fractal game games graph groups Haskell history hyperbinary idempotent identity integers interactive irrational Ivan Niven Lagrange lehmer lucas MaBloWriMo Mersenne monoids nim number numbers omega order permutations pi prime primes problem programming proof puzzle random reading rectangles repunit review sequence squares strategy subgroups symmetry test triangular video visualization X
### Blogroll

### Fun

### Reference

### Categories

- algebra (43)
- arithmetic (49)
- books (26)
- calculus (6)
- challenges (50)
- combinatorics (8)
- complex numbers (5)
- computation (38)
- convergence (9)
- counting (28)
- famous numbers (44)
- fibonacci (14)
- fractals (12)
- games (23)
- geometry (32)
- golden ratio (8)
- group theory (25)
- humor (6)
- induction (7)
- infinity (17)
- iteration (23)
- links (72)
- logic (6)
- meta (37)
- modular arithmetic (24)
- number theory (66)
- open problems (11)
- paradox (1)
- pascal's triangle (8)
- pattern (62)
- people (19)
- pictures (35)
- posts without words (5)
- primes (30)
- probability (5)
- programming (17)
- proof (56)
- puzzles (10)
- recursion (8)
- review (18)
- sequences (26)
- solutions (27)
- teaching (9)
- trig (3)
- Uncategorized (4)
- video (18)

### Archives

- February 2016 (2)
- January 2016 (8)
- December 2015 (5)
- November 2015 (29)
- August 2015 (3)
- June 2015 (2)
- April 2015 (1)
- May 2014 (1)
- December 2013 (1)
- October 2013 (1)
- July 2013 (1)
- June 2013 (1)
- May 2013 (1)
- April 2013 (3)
- March 2013 (3)
- February 2013 (2)
- January 2013 (5)
- December 2012 (3)
- November 2012 (4)
- October 2012 (5)
- September 2012 (1)
- August 2012 (4)
- July 2012 (1)
- June 2012 (6)
- May 2012 (2)
- April 2012 (3)
- March 2012 (1)
- February 2012 (4)
- January 2012 (5)
- December 2011 (1)
- November 2011 (7)
- October 2011 (4)
- September 2011 (6)
- July 2011 (2)
- June 2011 (4)
- May 2011 (5)
- April 2011 (2)
- March 2011 (4)
- February 2011 (1)
- January 2011 (1)
- December 2010 (1)
- November 2010 (4)
- October 2010 (2)
- September 2010 (1)
- August 2010 (1)
- July 2010 (1)
- June 2010 (2)
- May 2010 (3)
- April 2010 (1)
- February 2010 (6)
- January 2010 (3)
- December 2009 (8)
- November 2009 (7)
- October 2009 (3)
- September 2009 (3)
- August 2009 (1)
- June 2009 (4)
- May 2009 (5)
- April 2009 (4)
- March 2009 (2)
- February 2009 (1)
- January 2009 (7)
- December 2008 (1)
- October 2008 (2)
- September 2008 (7)
- August 2008 (1)
- July 2008 (1)
- June 2008 (1)
- April 2008 (5)
- February 2008 (4)
- January 2008 (4)
- December 2007 (3)
- November 2007 (12)
- October 2007 (2)
- September 2007 (4)
- August 2007 (3)
- July 2007 (1)
- June 2007 (3)
- May 2007 (1)
- April 2007 (4)
- March 2007 (3)
- February 2007 (7)
- January 2007 (1)
- December 2006 (2)
- October 2006 (2)
- September 2006 (6)
- July 2006 (4)
- June 2006 (2)
- May 2006 (6)
- April 2006 (3)
- March 2006 (6)

### Meta

# Tag Archives: four-coloring

## 17×17 4-coloring with no monochromatic rectangles

Quick, what’s special about the following picture? As just announced by Bill Gasarch, this is a grid which has been four-colored (that is, each point in the grid has been assigned one of four colors) in such a way that … Continue reading

Posted in open problems, pattern, people, pictures
Tagged 17x17, four-coloring, graph, grid, monochromatic, rectangles
5 Comments