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In mathematical set theory, a pseudo-intersection of a family of sets is an infinite set S such that each element of the family contains all but a finite number of elements of S. The pseudo-intersection number, sometimes denoted by the fraktur letter 𝔭, is the smallest size of a family of infinite subsets of the natural numbers that has the strong finite intersection property but has no pseudo-intersection.

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  • In mathematical set theory, a pseudo-intersection of a family of sets is an infinite set S such that each element of the family contains all but a finite number of elements of S. The pseudo-intersection number, sometimes denoted by the fraktur letter 𝔭, is the smallest size of a family of infinite subsets of the natural numbers that has the strong finite intersection property but has no pseudo-intersection. (en)
  • Inom mĂ€ngdteori, en del av matematiken, Ă€r ett pseudosnitt av en familj av mĂ€ngder en oĂ€ndlig mĂ€ngd S sĂ„ att varje element av familjen innehĂ„ller alla utom ett Ă€ndligt antal av elementen av S. Pseudosnittalet, ibland betecknad med 𝔭, Ă€r den minsta storleken av en familj av oĂ€ndliga delmĂ€ngder av naturliga talen som har den men har inget pseudosnitt. (sv)
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  • In mathematical set theory, a pseudo-intersection of a family of sets is an infinite set S such that each element of the family contains all but a finite number of elements of S. The pseudo-intersection number, sometimes denoted by the fraktur letter 𝔭, is the smallest size of a family of infinite subsets of the natural numbers that has the strong finite intersection property but has no pseudo-intersection. (en)
  • Inom mĂ€ngdteori, en del av matematiken, Ă€r ett pseudosnitt av en familj av mĂ€ngder en oĂ€ndlig mĂ€ngd S sĂ„ att varje element av familjen innehĂ„ller alla utom ett Ă€ndligt antal av elementen av S. Pseudosnittalet, ibland betecknad med 𝔭, Ă€r den minsta storleken av en familj av oĂ€ndliga delmĂ€ngder av naturliga talen som har den men har inget pseudosnitt. (sv)
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  • Pseudo-intersection (en)
  • Pseudosnitt (sv)
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