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  2. Non-standard model of arithmetic - Wikipedia

    en.wikipedia.org/wiki/Non-standard_model_of...

    The term standard model of arithmetic refers to the standard natural numbers 0, 1, 2, …. The elements of any model of Peano arithmetic are linearly ordered and possess an initial segment isomorphic to the standard natural numbers. A non-standard model is one that has additional elements outside this initial segment.

  3. Nonstandard analysis - Wikipedia

    en.wikipedia.org/wiki/Nonstandard_analysis

    Robinson's original approach was based on these nonstandard models of the field of real numbers. His classic foundational book on the subject Nonstandard Analysis was published in 1966 and is still in print. [8] On page 88, Robinson writes: The existence of nonstandard models of arithmetic was discovered by Thoralf Skolem (1934).

  4. Non-standard model - Wikipedia

    en.wikipedia.org/wiki/Non-standard_model

    In model theory, a discipline within mathematical logic, a non-standard model is a model of a theory that is not isomorphic to the intended model (or standard model). [ 1 ] Existence

  5. Tennenbaum's theorem - Wikipedia

    en.wikipedia.org/wiki/Tennenbaum's_theorem

    The standard system of the model is the collection {:}. It can be shown that the standard system of any nonstandard model of PA contains a nonrecursive set, either by appealing to the incompleteness theorem or by directly considering a pair of recursively inseparable r.e. sets (Kaye 1991:154).

  6. List of mathematical logic topics - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_logic...

    Institutional model theory. Institution (computer science) Non-standard analysis. Non-standard calculus; Hyperinteger; Hyperreal number; Transfer principle; Overspill; Elementary Calculus: An Infinitesimal Approach; Criticism of non-standard analysis; Standard part function; Set theory. Forcing (mathematics) Boolean-valued model; Kripke ...

  7. Elementary equivalence - Wikipedia

    en.wikipedia.org/wiki/Elementary_equivalence

    More generally, any first-order theory with an infinite model has non-isomorphic, elementarily equivalent models, which can be obtained via the Löwenheim–Skolem theorem. Thus, for example, there are non-standard models of Peano arithmetic , which contain other objects than just the numbers 0, 1, 2, etc., and yet are elementarily equivalent ...

  8. Goodstein's theorem - Wikipedia

    en.wikipedia.org/wiki/Goodstein's_theorem

    A Classification of non standard models of Peano Arithmetic by Goodstein's theorem - Thesis by Dan Kaplan, Franklan and Marshall College Library; Definition of Goodstein sequences in Haskell and the lambda calculus; The Hydra game implemented as a Java applet; Javascript implementation of a variant of the Hydra game

  9. List of first-order theories - Wikipedia

    en.wikipedia.org/wiki/List_of_first-order_theories

    Axioms (4) and (5) are the standard recursive definition of addition; (6) and (7) do the same for multiplication. Robinson arithmetic can be thought of as Peano arithmetic without induction. Q is a weak theory for which Gödel's incompleteness theorem holds. Axioms: ∀x ¬ Sx = 0; ∀x ¬ x = 0 → ∃y Sy = x; ∀x∀y Sx = Sy → x = y; ∀x ...

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