User Portlet User Portlet

Discussions
Very nice. Of course you know that triangles fail in the classic case because the vertex crashes into the road. Your Reuleaux method seems to not have that problem. One would have to zoom in closely to make sure the vertex happily slides into the...
The first proof of nonexistence is: [SS] S. Świerczkowski, On a free group of rotations of the Euclidean space, Indag. Math. 20 (1958) 376\[Dash]378. Problem first posed: [HS] H. Steinhaus, Problem 175, Coll. Math., 4 (1957) 243. I now have a demo on...