Quadruple 1812712 213935615 2008-05-21T12:39:40Z Kietotheworld 330685 {{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. {{math-stub}} [[Category:Sequences and series]] [[eo:Vikipedio:Projekto matematiko/Kvaropo]]