Quidam65
no edit summary
00:41
-24
DavidB4-bot
→top: clean up & uniformity
20:53
RandRover
Rewrote a portion of the article; the title is the PROBLEM. The article is about the THEOREM.
22:59
+130
PatrickD
I'd never heard of the two-dimensional version!
04:11
+86
Aschlafly
a start
03:54
+352