http://mathforum.org/kb List of forum topics en http://mathforum.org/kb/thread.jspa?messageID=7133643&tstart=0#7133643 > I now see that 20 is indeed the maximum, that an
> example is easy to find, that my intuition was]]> Jul 22, 2010 9:53:35 AM Jul 22, 2010 9:53:35 AM mary@krimmel.net 0 http://mathforum.org/kb/thread.jspa?messageID=7133278&tstart=0#7133278 Jul 21, 2010 10:48:47 PM Jul 21, 2010 10:48:47 PM mary@krimmel.net 1 http://mathforum.org/kb/thread.jspa?messageID=7132082&tstart=0#7132082 Jul 20, 2010 2:15:37 PM Jul 20, 2010 2:15:37 PM mary@krimmel.net 0 http://mathforum.org/kb/thread.jspa?messageID=7130592&tstart=0#7130592 forming a right angle, no 4 in a plane. Draw all 15 lines between]]> Jul 19, 2010 2:45:55 AM Jul 19, 2010 2:45:55 AM janis0316 3