Problem A. 638. (March 2015)

A. 638. Does there exist a simple, closed polyline in the 3-dimensional Cartesian co-ordinate system whose perpendicular projection onto every co-ordinate plane is a cycleless graph?

Proposed by: Imre Leader, Cambridge

(5 pont)

Deadline expired on April 10, 2015.

Statistics:

3 students sent a solution.
5 points:	Williams Kada.
0 point:	2 students.

Problems in Mathematics of KöMaL, March 2015