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  2. Infinite set - Wikipedia

    en.wikipedia.org/wiki/Infinite_set

    In ZF, a set is infinite if and only if the power set of its power set is a Dedekind-infinite set, having a proper subset equinumerous to itself. [4] If the axiom of choice is also true, then infinite sets are precisely the Dedekind-infinite sets. If an infinite set is a well-orderable set, then it has many well-orderings which are non-isomorphic.

  3. Finite set - Wikipedia

    en.wikipedia.org/wiki/Finite_set

    is a finite set with five elements. The number of elements of a finite set is a natural number (possibly zero) and is called the cardinality (or the cardinal number) of the set. A set that is not a finite set is called an infinite set. For example, the set of all positive integers is infinite:

  4. Cardinal number - Wikipedia

    en.wikipedia.org/wiki/Cardinal_number

    Two sets have the same cardinality if, and only if, there is a one-to-one correspondence (bijection) between the elements of the two sets. In the case of finite sets, this agrees with the intuitive notion of number of elements. In the case of infinite sets, the behavior is more complex.

  5. Set (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Set_(mathematics)

    In mathematics, a set is a collection of different [1] things; [2] [3] [4] these things are called elements or members of the set and are typically mathematical objects of any kind: numbers, symbols, points in space, lines, other geometrical shapes, variables, or even other sets. [5] A set may have a finite number of elements or be an infinite set.

  6. Cantor's theorem - Wikipedia

    en.wikipedia.org/wiki/Cantor's_theorem

    Much more significant is Cantor's discovery of an argument that is applicable to any set, and shows that the theorem holds for infinite sets also. As a consequence, the cardinality of the real numbers , which is the same as that of the power set of the integers , is strictly larger than the cardinality of the integers; see Cardinality of the ...

  7. Dedekind-infinite set - Wikipedia

    en.wikipedia.org/wiki/Dedekind-infinite_set

    This definition of "infinite set" should be compared with the usual definition: a set A is infinite when it cannot be put in bijection with a finite ordinal, namely a set of the form {0, 1, 2, ..., n−1} for some natural number n – an infinite set is one that is literally "not finite", in the sense of bijection.

  8. Controversy over Cantor's theory - Wikipedia

    en.wikipedia.org/wiki/Controversy_over_Cantor's...

    [18] In other words, the only access we have to the infinite is through the notion of limits, and hence, we must not treat infinite sets as if they have an existence exactly comparable to the existence of finite sets. Cantor's ideas ultimately were largely accepted, strongly supported by David Hilbert, amongst others.

  9. Baire space (set theory) - Wikipedia

    en.wikipedia.org/wiki/Baire_space_(set_theory)

    This leads to a representation of the Baire space as the set of all infinite paths passing through the full tree ω <ω of finite sequences of natural numbers ordered by extension. Each finite initial segment σ is a node of the tree of finite sequences. Each open set is determined by a countable union S of nodes of that tree. A point in Baire ...

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