Quadruple

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For international treaties with the name, see Quadruple Alliance

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In mathematics, a quadruple or quadruplet is an n-tuple with n being 4. This means it depicts four elements, 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, The Quadruple is the act of winning four top tier 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. (see RAID 1)
• A figure skating jump with four revolutions.

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