21 Oct
2013
21 Oct
'13
10:53 a.m.
On Mon, Oct 21, 2013 at 3:52 AM, Joerg Arndt <arndt@jjj.de> wrote:
Pick's theorem (cf. http://en.wikipedia.org/wiki/Pick's_theorem):
Square grid, every second column shifted by a half unit: A = i/2 + b/2 - 1
where b counts only the boundary points whose local neighborhood is not concave (i.e., 90 degrees of outside, 270 degrees of inside).
What about a square of side 2? Doesn't this have i = 1 and b = 4? Andy Latto andy.latto@pobox.com