Quadruple
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213935615
2008-05-21T12:39:40Z
Kietotheworld
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{{Wiktionary}}
In [[mathematics]], a '''quadruple''' or '''quadruplet''' is an [[Tuple|''n''-tuple]] with ''n'' being 4. This means it depicts four [[element (mathematics)|element]]s, with the [[ordering|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 (soccer)|football]], '''[[The Quadruple]]''' is the act of winning four top tier trophies in one season.
* To '''quadruple''' a magnitude is to [[multiplication|multiply]] it by [[4 (number)|4]].
* '''Quadruplets''' are four [[child]]ren born in one [[pregnancy]]. See [[Multiple birth]].
* A '''quadruplet''' is a type of note in [[music]] (see [[tuplet]]).
* A [[Redundancy (engineering)|redundant]] [[backup]] system that has three secondary systems to take over if the primary fails. (see [[RAID#RAID 1|RAID 1]])
<!--* A quadruple can refer to a set of four numbers in a given order, for example, describing the location of a point in four-dimensions (much like an [[ordered pair]].)-->
* A [[figure skating jump]] with four revolutions.
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[[Category:Sequences and series]]
[[eo:Vikipedio:Projekto matematiko/Kvaropo]]