In mathematics, a dessin d'enfant (French for a "child's drawing") is a connected graph with a cyclic ordering of edges at each vertex, and each vertex being colored black or white and with no edge having endpoints of the same color. History Main article: History of mathematics In addition to recognizing how to count concrete objects, prehistoric peoples also recognized how to count abstract quantities, like time -- days, seasons, years. ... One major problem that has plagued graph theory since its inception is the consistent lack of consistency in terminology. ... Enhanced Data Rates for GSM Evolution (EDGE) is a digital mobile phone technology which acts as a bolt-on enhancement to 2G and 2. ... In geometry, a vertex (Latin: whirl, whirlpool; plural vertices) is a corner of a polygon (where two sides meet) or of a polyhedron (where three or more faces and an equal number of edges meet). ...

Dessins d'enfant have important connections to several major areas of mathematics. For example, dessins arise commonly from ramified covers of the Riemann sphere. In mathematics, the Riemann sphere is the unique simply-connected, compact, Riemann surface. ...