In mathematics, the phrase almost all has a number of specialised uses. "Almost all" is sometimes used synonymously with "all but finitely many" (formally, a cofinite set) or "all but a countable set" (formally, a cocountable set); see almost. When speaking about the reals, sometimes it means "all reals but a set of Lebesgue measure zero". In this sense almost all reals are not a member of the Cantor set even though the Cantor set is uncountable.

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  • In mathematics, the phrase almost all has a number of specialised uses. "Almost all" is sometimes used synonymously with "all but finitely many" (formally, a cofinite set) or "all but a countable set" (formally, a cocountable set); see almost. When speaking about the reals, sometimes it means "all reals but a set of Lebesgue measure zero". In this sense almost all reals are not a member of the Cantor set even though the Cantor set is uncountable. In number theory, if P(n) is a property of positive integers, and if p(N) denotes the number of positive integers n less than N for which P(n) holds, and if p(N)/N → 1 as N → ∞, then we say that "P(n) holds for almost all positive integers n" and write <math>(\forall^\infty n) P(n). </math> For example, the prime number theorem states that the number of prime numbers less than or equal to N is asymptotically equal to N/ln N. Therefore the proportion of prime integers is roughly 1/ln N, which tends to 0. Thus, almost all positive integers are composite (not prime), however there are still an infinite number of primes. Occasionally, "almost all" is used in the sense of "almost everywhere" in measure theory, or in the closely related sense of "almost surely" in probability theory.
  • Fast alle ist in der Mathematik eine Abkürzung für alle bis auf endlich viele, meist im Zusammenhang mit abzählbaren Grundmengen. Manchmal wird diese Phrase in der Maß- und Integrationstheorie statt der korrekteren fast überall, d. h. überall mit Ausnahme einer Nullmenge, verwendet. Man sagt, eine Eigenschaft <math>\mathcal{E}</math> werde von fast allen Elementen einer unendlichen Menge erfüllt, wenn nur endlich viele Elemente <math>\mathcal{E}</math> nicht erfüllen. Teilmengen, die fast alle Elemente einer Menge enthalten, heißen auch koendlich oder kofinit, weil ihr Komplement endlich ist.
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  • yes
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  • June 2009
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  • In mathematics, the phrase almost all has a number of specialised uses. "Almost all" is sometimes used synonymously with "all but finitely many" (formally, a cofinite set) or "all but a countable set" (formally, a cocountable set); see almost. When speaking about the reals, sometimes it means "all reals but a set of Lebesgue measure zero". In this sense almost all reals are not a member of the Cantor set even though the Cantor set is uncountable.
  • Fast alle ist in der Mathematik eine Abkürzung für alle bis auf endlich viele, meist im Zusammenhang mit abzählbaren Grundmengen. Manchmal wird diese Phrase in der Maß- und Integrationstheorie statt der korrekteren fast überall, d. h. überall mit Ausnahme einer Nullmenge, verwendet.
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  • Almost all
  • Fast alle
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