Torsten Sillke, BI, 06.04.93 Replace the edges of a cube by three different resistors a, b, and c. Parallel edges get equal resistors.
Parallel edges get equal resistors.
Compute the resistance between opposite vertices. If you have six different resistors, the opposite ones are equal. The current enters and leaves at the vertices where a, b, c meet. Some time ago, I tried a generalization. Only the parrallel edges get the same resistance.