Does anyone know an answer to the topological puzzle for supplying Gas, Water and Electricity to 3 houses without the connections crossing?
Draw lines from G (Gas), W (Water) and E (Electricity) to each of the three houses, but the lines must not cross and all the houses must be connected.
G W E
1 2 3
I have seen a 3-D solution but know a better 2-D solution, and wondered
if anyone had any other solutions?