In mathematics, a quadruple or quadruplet is an n-tuple with n being 4. This means it depicts four element, with the order of the elements carrying meaning. This differs from a set, where the order of the elements is meaningless and where no element could exist more than once. Derived from this abstract meaning, it is used in several other contexts including: In football, a quadruple is the act of winning four trophies in one season. To quadruple a magnitude is to multiply it by 4. Quadruplets are four children born in one pregnancy. See Multiple birth. A quadruplet is a type of note in music (see tuplet). A redundant backup system that has three secondary systems to take over if the primary fails. A figure skating jump with four revolutions. Sequences and seriesProjekto matematiko/Kvaropo

Source: http://en.wikipedia.org/wiki/Quadruple
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