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三元数（英語：Trionion）是指建立在实数域上的三维代数系統。這種代數系統無法被良好構建，因此這個代數系統並未有一個廣泛被接受的定義模式。一般而言，通常會稱三元數不存在。這是因為三元数的乘法运...