Definitions for four color theorem
four col·or the·o·rem

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1. Four color theorem

   In mathematics, the four color theorem, or the four color map theorem, states that, given any separation of a plane into contiguous regions, producing a figure called a map, no more than four colors are required to color the regions of the map so that no two adjacent regions have the same color. Two regions are called adjacent if they share a common boundary that is not a corner, where corners are the points shared by three or more regions. For example, in the map of the United States of America, Utah and Arizona are adjacent, but Utah and New Mexico, which only share a point that also belongs to Arizona and Colorado, are not. Despite the motivation from coloring political maps of countries, the theorem is not of particular interest to mapmakers. According to an article by the math historian Kenneth May, “Maps utilizing only four colours are rare, and those that do usually require only three. Books on cartography and the history of mapmaking do not mention the four-color property.” Three colors are adequate for simpler maps, but an additional fourth color is required for some maps, such as a map in which one region is surrounded by an odd number of other regions that touch each other in a cycle. The five color theorem, which has a short elementary proof, states that five colors suffice to color a map and was proven in the late 19th century; however, proving that four colors suffice turned out to be significantly harder. A number of false proofs and false counterexamples have appeared since the first statement of the four color theorem in 1852.

How to pronounce four color theorem?

1. Alex

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How to say four color theorem in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of four color theorem in Chaldean Numerology is: 5

2. Pythagorean Numerology

   The numerical value of four color theorem in Pythagorean Numerology is: 9

References

1. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=four color theorem