When http://blog.computationalcomplexity.org/2012/02/17x17-problem-solved-also-1... | Hacker News

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		thedufer on Jan 9, 2014 \| parent \| context \| favorite \| on: Lessons from working 6 months on a math problem an... When http://blog.computationalcomplexity.org/2012/02/17x17-proble... was written, 12x21 was still open (so "17x17, 17x18, and 18x18 were the last remaining cases" is not true). Do you know if this has changed (that article is ~2 years old)?

jacobolus on Jan 9, 2014 | [–]

If you read down in the comments of that post you can see it was solved. Or see http://11235813tdd.blogspot.com/2012/02/rectangle-free-grid-...

stephencanon on Jan 9, 2014 | [–]

See http://arxiv.org/abs/1005.3750 (tables 19 and 22 in particular).

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