Graph

less more | at revision 192: (0) -100 -30 -10 -2 +2 +10 +30 tip

Proof 38-41.
Wed, 03 Apr 2013 22:14:56 -0400, by Steve Losh
Proof 32-37.
Wed, 03 Apr 2013 22:05:04 -0400, by Steve Losh

less more | at revision 192: (0) -100 -30 -10 -2 +2 +10 +30 tip