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  2. Risk (game) - Wikipedia

    en.wikipedia.org/wiki/Risk_(game)

    Risk is a strategy board game of diplomacy, conflict and conquest [1] for two to six players. The standard version is played on a board depicting a political map of the world, divided into 42 territories, which are grouped into six continents. Turns rotate among players who control armies of playing pieces with which they attempt to capture ...

  3. Five color theorem - Wikipedia

    en.wikipedia.org/wiki/Five_color_theorem

    A Five-Color Map. The five color theorem is a result from graph theory that given a plane separated into regions, such as a political map of the countries of the world, the regions may be colored using no more than five colors in such a way that no two adjacent regions receive the same color. The five color theorem is implied by the stronger ...

  4. Four color theorem - Wikipedia

    en.wikipedia.org/wiki/Four_color_theorem

    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. Adjacent means that two regions share a common boundary of ...

  5. Left- and right-hand traffic - Wikipedia

    en.wikipedia.org/wiki/Left-_and_right-hand_traffic

    This is an accepted version of this page This is the latest accepted revision, reviewed on 17 September 2024. Directionality of traffic flow by jurisdiction Countries by direction of road traffic, c. 2020 ⇅ Left-hand traffic ⇵ Right-hand traffic Left-hand traffic (LHT) and right-hand traffic (RHT) are the practices, in bidirectional traffic, of keeping to the left side and to the right ...

  6. David Gauthier - Wikipedia

    en.wikipedia.org/wiki/David_Gauthier

    Contractarian ethics (morals by agreement), constrained maximization, Gauthier's Lockean proviso [2] David Gauthier FRSC (/ ˈɡɔːtieɪ /; 10 September 1932 – 9 November 2023) was a Canadian philosopher best known for his neo- Hobbesian or contractarian theory of morality, as developed in his 1986 book Morals by Agreement.

  7. Map-coloring games - Wikipedia

    en.wikipedia.org/wiki/Map-coloring_games

    A trichrome map-coloring game in progress, on a map of the United States. On their turn, a player may choose any of the three colors to shade an unshaded state, so long as it would not share a color with a bordering state. Three states have become unshadeable, being surrounded by all three colors. Several map-coloring games are studied in ...

  8. Best response - Wikipedia

    en.wikipedia.org/wiki/Best_response

    In game theory, the best response is the strategy (or strategies) which produces the most favorable outcome for a player, taking other players' strategies as given. [1] The concept of a best response is central to John Nash's best-known contribution, the Nash equilibrium, the point at which each player in a game has selected the best response (or one of the best responses) to the other players ...

  9. Game theory - Wikipedia

    en.wikipedia.org/wiki/Game_theory

    Strategy. Game theory is the study of mathematical models of strategic interactions. [1] It has applications in many fields of social science, and is used extensively in economics, logic, systems science and computer science. [2] Initially, game theory addressed two-person zero-sum games, in which a participant's gains or losses are exactly ...