Four colour theorem



four colour map theorem

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  • Four-corners

    [fawr-kawr-nerz, fohr-] /ˈfɔrˈkɔr nərz, ˈfoʊr-/ noun, (used with a singular or plural verb) Northern and Western U.S. 1. a place where roads cross at right angles; a crossroads. noun 1. a point in the SW U.S., at the intersection of 37° N latitude and 109° W longitude, where the boundaries of four states—Arizona, Utah, Colorado, […]

  • Four-corner town

    noun phrase A very small town; a crossroads: We were flabbergasted by these four-corner towns with four bars (1980s+)



  • Four-cycle

    [fawr-sahy-kuh l, fohr-] /ˈfɔrˌsaɪ kəl, ˈfoʊr-/ adjective 1. noting or pertaining to an internal-combustion engine in which a complete cycle in each cylinder requires four strokes, one to draw in air or an air-fuel mixture, one to compress it, one to ignite it and do work, and one to scavenge the cylinder. adjective 1. (US […]

  • Four-deal bridge

    noun 1. a version of bridge in which four hands only are played, the players then cutting for new partners



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