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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.
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 ...
In graph-theoretic terms, the theorem states that for a loopless planar graph, its chromatic number is ().. The intuitive statement of the four color theorem – "given any separation of a plane into contiguous regions, the regions can be colored using at most four colors so that no two adjacent regions have the same color" – needs to be interpreted appropriately to be correct.
Free Aceh Movement Adjara African Union Alexandria Algeria Algeria (naval ensign) Alphen aan den Rijn Amazonas Amsterdam [29] Angola [30] [31] Arkansas Armenia [32] [33] Artigas Flag, cooficial flag of Uruguay and former flag of Liga Federal Aruba Australia [34] [35] [36] Australia (civil ensign) Australia (naval ensign)
A four-color deck (US) or four-colour pack (UK) is a deck of playing cards identical to the standard French deck except for the color of the suits. In a typical English four-color deck, hearts are red and spades are black as usual, but clubs are green and diamonds are blue. [ 2 ]
Four Color, also known as Four Color Comics and Dell Four Color, is an American comic book anthology series published by Dell Comics between 1939 and 1962. The title is a reference to the four basic colors used when printing comic books ( cyan , magenta , yellow and black at the time). [ 3 ]
Four color cards (Chinese: 四色牌; pinyin: Sì Sè Pái) is a game of the rummy family of card games, with a relatively long history in southern China. In Vietnam the equivalent game is known as tứ sắc ( Sino-Vietnamese pronunciation of 四色).
Originally he used only five colors, but later he added orange and indigo to match the number of musical notes in the major scale. [2] [3] The Munsell color system, the first formal color notation system (1905), names only five "principal hues": red, yellow, green, blue, and purple. [4]
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