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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.
Introduction to vector map making with Inkscape: download, open with Inkscape and follow the exercises Create and color map zones: fr: Inkscape Create and color map zones freehand. Create and color independent zones in Inkscape starting from a map showing borders of countries or other zones. (See also next tutorial.)
An introduction explaining the style objectives and the most convenient way to create a such map. A color summary table with two (up-to-date) map examples. The naming convention for upload, and other advice like the scale or the legend. An up-to-date SVG template. Further details on history, limits, and possible expansions. A gallery of examples.
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 ...
English: This is a map of France where no two neighboring first-level administrative divisions have the same color, following the guidelines of the four-color theorem, which states that any loopless planar graph can be colored with four or fewer colors. This was created with Mathematica 13.2's function FindVertexColoring and GeoRegionValuePlot ...
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The following discussion is a summary based on the introduction to Every Planar Map is Four Colorable (Appel & Haken 1989). Although flawed, Kempe's original purported proof of the four color theorem provided some of the basic tools later used to prove it. The explanation here is reworded in terms of the modern graph theory formulation above.