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  2. Four color theorem - Wikipedia

    en.wikipedia.org/wiki/Four_color_theorem

    In graph-theoretic terms, the theorem states that for 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.

  3. Map coloring - Wikipedia

    en.wikipedia.org/wiki/Map_coloring

    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.

  4. Hadwiger–Nelson problem - Wikipedia

    en.wikipedia.org/wiki/Hadwiger–Nelson_problem

    In geometric graph theory, the Hadwiger–Nelson problem, named after Hugo Hadwiger and Edward Nelson, asks for the minimum number of colors required to color the plane such that no two points at distance 1 from each other have the same color. The answer is unknown, but has been narrowed down to one of the numbers 5, 6 or 7.

  5. Edge coloring - Wikipedia

    en.wikipedia.org/wiki/Edge_coloring

    The edge-coloring problem asks whether it is possible to color the edges of a given graph using at most k different colors, for a given value of k, or with the fewest possible colors. The minimum required number of colors for the edges of a given graph is called the chromatic index of the graph. For example, the edges of the graph in the ...

  6. 20 Crewneck Sweatshirts to Dress Up, Down, or for Every Look ...

    www.aol.com/best-crewneck-sweatshirts-dress-down...

    10-Year Crewneck Sweatshirt. Flint and Tinder is a favorite around these parts, and our editors love this sweatshirt as much as we love the brand's sturdy outerwear.This American-made sweatshirt ...

  7. 22 Cooler-Than-Cool Crewneck Sweatshirts to Add to Your Closet

    www.aol.com/lifestyle/18-cooler-cool-crewneck...

    Comfy crewnecks are a wardrobe staple. Here are the 18 best crewneck sweatshirts for men, whether they're graphic, vintage, minimalist, or super functional.

  8. South Africa leads Sri Lanka by 221 runs in 2nd test - AOL

    www.aol.com/south-africa-leads-sri-lanka...

    South Africa was building a defendable total against Sri Lanka as it reached 191-3 in its second innings and a lead of 221 runs on day three Saturday of the second test. Aiden Markram's 55 moved ...

  9. Critical graph - Wikipedia

    en.wikipedia.org/wiki/Critical_graph

    In graph theory, a critical graph is an undirected graph all of whose proper subgraphs have smaller chromatic number. In such a graph, every vertex or edge is a critical element, in the sense that its deletion would decrease the number of colors needed in a graph coloring of the given graph. Each time a single edge or vertex (along with its ...

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