Date: Oct 2, 2013 8:30 PM Author: Haran Pilpel Subject: Re: cotpi 69 - Black and white plane quasi <quasi@null.set> writes:

> Does there exist a 2-coloring of Q^2 such that no two points

> of Q^2 which are 1 unit apart have the same color?

Yes. This is a result of Woodall from 1973. ("Distances realized by sets

covering the plane.")