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In mathematics, a domino is a polyomino of order 2, that is, a polygon in the plane made of two equal-sized squares connected edge-to-edge. When rotations and reflections are not considered to be distinct shapes, there is only one ''free'' domino. Since it has reflection symmetry, it is also the only ''one-sided'' domino (with reflections considered distinct). When rotations are also considered distinct, there are two ''fixed'' dominoes: The second one can be created by rotating the one above by 90°. In a wider sense, the term ''domino'' is often understood to simply mean a tile of any shape. ==See also== * Domino tiling, a covering of a geometric figure with dominoes; these figure in several celebrated problems: * * Aztec diamond problem * * Mutilated chessboard problem, a domino tiling problem concerning an 8×8 chessboard with two deleted squares * Dominoes, a set of domino-shaped gaming pieces 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Domino (mathematics)」の詳細全文を読む スポンサード リンク
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