Countable set
In mathematics, a countable set is a set with the same cardinality (number of elements) as some subset of the set of natural numbers. A countable set is either a finite set or a countably infinite set. Whether finite or infinite, the elements of a countable set can always be counted one at a time and—although the counting may never finish—every element of the set is associated with a unique natural number.
CountabilityCountableCountable SetCountable infiniteCountable infinityCountable setsCountable spaceCountablyCountably infiniteCountably infinite setCountably manyDenumerabilityDenumerableDenumerable SetDenumerable setDenumerably InfiniteInfinitely countableInfinitely countable setListable infinityListable set
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1 − 2 + 3 − 4 + ⋯Abstract analytic number theoryAdmissible ordinalAdmissible ruleAleph numberAlexander S. KechrisAlgebraic closureAlgebraic numberAlgebraic number fieldAlgebraically closed groupAlgorithmically random sequenceAlmostAlmost allAlphabet (formal languages)Anatoly SamoilenkoAnderson–Kadec theoremAnne C. MorelAntiderivativeApeirogonArithmetical setAsymmetric graphAutomata theoryAxiom of choiceAxiom of countabilityAxiom of countable choiceAxiom of dependent choiceAxiom of finite choiceAxiom of limitation of sizeAxiom schemaAxiomatic systemBL (logic)Back-and-forth methodBaer–Specker groupBaire category theoremBaire setBaire spaceBaire space (set theory)Banach gameBanach spaceBanach–Tarski paradox
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Countable set
In mathematics, a countable set is a set with the same cardinality (number of elements) as some subset of the set of natural numbers. A countable set is either a finite set or a countably infinite set. Whether finite or infinite, the elements of a countable set can always be counted one at a time and—although the counting may never finish—every element of the set is associated with a unique natural number.
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Een aftelbare verzameling is i ...... ar oneindig, of overaftelbaar.
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En matematiko, kalkulebla aro ...... alef-nombro) aŭ (la komenca ).
@eo
En matemàtiques, un conjunt és ...... a de la mesura i en topologia.
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En matemáticas, un conjunto nu ...... s llamada matemática discreta.
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En mathématiques, un ensemble ...... de la mesure et en topologie.
@fr
En uppräknelig mängd är en män ...... neliga mängder är uppräknelig.
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In der Mengenlehre wird eine M ...... ung siehe auch Aleph-Funktion.
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In matematica, e più in partic ...... te il suo argomento diagonale.
@it
In mathematics, a countable se ...... s called discrete mathematics.
@en
Matematikan, multzo bat zenbak ...... , haren kardinal bera duelako.
@eu
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Een aftelbare verzameling is i ...... ar oneindig, of overaftelbaar.
@nl
En matematiko, kalkulebla aro ...... alef-nombro) aŭ (la komenca ).
@eo
En matemàtiques, un conjunt és ...... nic nombre parell i viceversa.
@ca
En matemáticas, un conjunto nu ...... s llamada matemática discreta.
@es
En mathématiques, un ensemble ...... onc dits « non dénombrables ».
@fr
En uppräknelig mängd är en män ...... neliga mängder är uppräknelig.
@sv
In der Mengenlehre wird eine M ...... höchstens abzählbar bedeuten.
@de
In matematica, e più in partic ...... ente denotata con il simbolo .
@it
In mathematics, a countable se ...... with a unique natural number.
@en
Matematikan, multzo bat zenbak ...... , haren kardinal bera duelako.
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label
Abzählbare Menge
@de
Aftelbare verzameling
@nl
Conjunt numerable
@ca
Conjunto contável
@pt
Conjunto numerable
@es
Countable set
@en
Ensemble dénombrable
@fr
Insieme numerabile
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Kalkulebla aro
@eo
Multzo zenbakigarri
@eu