Four color theorem: one switch is not enough :-(

Experimenting with the Python program, I have found that if you have an F5 impasse, a single switch may not be enough to solve the impasse. It means: counterexample found.

This is a bad news, since I believed that a single switch, on an appropriate edge, could have been the key to solve the theorem.


Since a limited number of switches still work, I am going to study if two switches, on appropriate edges, may work.


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