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Example of a four-colored map A four-colored map of the states of the United States (ignoring lakes and oceans). In mathematics, the four color theorem, or the four color map theorem, states that no more than four colors are required to color the regions of any map so that no two adjacent regions have the same color.
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Changing the colors to make it easier to apply the four color theorem while extending the plane to include the water and other countries. 19:59, 26 August 2011 959 × 593 (242 KB)
Changed colour scheme, updated map outlines with the ones from the original blank map: 07:00, 10 February 2018: 940 × 415 (1.45 MB) Fibonacci: Fixed the Azerbaijan-Turkey border. 04:24, 25 January 2015: 940 × 415 (1.45 MB) Fibonacci: Coloured city states and oceans for better contrast. 04:16, 25 January 2015: 940 × 415 (1.45 MB) Fibonacci
In cartographic design, map coloring is the act of choosing colors as a form of map symbol to be used on a map. Color is a very useful attribute to depict different features on a map. [ 1 ] Typical uses of color include displaying different political divisions, different elevations, or different kinds of roads.
English: World map colored in green, yellow, blue and red to illustrate the four color theorem. This map considers just only land boundaries, although insular States have been colored too. This map considers just only land boundaries, although insular States have been colored too.
An entirely different approach was needed for the much older problem of finding the number of colors needed for the plane or sphere, solved in 1976 as the four color theorem by Haken and Appel. On the sphere the lower bound is easy, whereas for higher genera the upper bound is easy and was proved in Heawood's original short paper that contained ...
Stake. Gradient maps are both at the center and at the basic level of map making on Wikipedia. A simple blank map and fill with color tool are needed. To continue to build a coherent Wikipedia display, this page suggests the most suitable SVG source files together with a blue-based color ramps from academic, screen friendly, print friendly, and color-blind friendly ColorBrewer2 by cartography ...