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Francis inquired with Frederick regarding it, who then took it to De Morgan Francis Guthrie graduated later in , and later became a professor of mathematics in South Africa. According to De Morgan: "A student of mine [Guthrie] asked me to day to give him a reason for a fact which I did not know was a fact—and do not yet.

He says that if a figure be any how divided and the compartments differently colored so that figures with any portion of common boundary line are differently colored—four colors may be wanted but not more—the following is his case in which four colors are wanted. Query cannot a necessity for five or more be invented…" Wilson , p.

There were several early failed attempts at proving the theorem.

De Morgan believed that it followed from a simple fact about four regions, though he didn't believe that fact could be derived from more elementary facts. This arises in the following way. We never need four colors in a neighborhood unless there be four counties, each of which has boundary lines in common with each of the other three. Such a thing cannot happen with four areas unless one or more of them be inclosed by the rest; and the color used for the inclosed county is thus set free to go on with.

Now this principle, that four areas cannot each have common boundary with all the other three without inclosure, is not, we fully believe, capable of demonstration upon anything more evident and more elementary; it must stand as a postulate.

It was not until that Kempe's proof was shown incorrect by Percy Heawood , and in , Tait's proof was shown incorrect by Julius Petersen —each false proof stood unchallenged for 11 years.

Proof by computer[ edit ] During the s and s German mathematician Heinrich Heesch developed methods of using computers to search for a proof.

Notably he was the first to use discharging for proving the theorem, which turned out to be important in the unavoidability portion of the subsequent Appel—Haken proof. He also expanded on the concept of reducibility and, along with Ken Durre, developed a computer test for it. Unfortunately, at this critical juncture, he was unable to procure the necessary supercomputer time to continue his work.

While other teams of mathematicians were racing to complete proofs, Kenneth Appel and Wolfgang Haken at the University of Illinois announced, on June 21, , [16] that they had proved the theorem.

They were assisted in some algorithmic work by John A. The proof showed that such a minimal counterexample cannot exist, through the use of two technical concepts: [17] An unavoidable set is a set of configurations such that every map that satisfies some necessary conditions for being a minimal noncolorable triangulation such as having minimum degree 5 must have at least one configuration from this set. A reducible configuration is an arrangement of countries that cannot occur in a minimal counterexample.

If a map contains a reducible configuration, then the map can be reduced to a smaller map. This smaller map has the condition that if it can be colored with four colors, then the original map can also. Understanding Thomas' Calculus homework has never been easier than with Chegg Study. It's easier to figure out tough problems faster using Chegg Study.

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