26 Dec
2012
26 Dec
'12
4:36 a.m.
On Tuesday 25 December 2012 21:10:51 Dan Asimov wrote:
Suppose X is a subset of size 12 of the open interval (1,12).
Show there must exist distinct x, y, z in X such that there is an acute-angled triangle of sides x, y, z.
Nice! (I laughed out loud when I realised where the 12 in the upper bound of the interval came from.) -- g