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  2. Minimal counterexample - Wikipedia

    en.wikipedia.org/wiki/Minimal_counterexample

    The assumption that if there is a counterexample, there is a minimal counterexample, is based on a well-ordering of some kind. The usual ordering on the natural numbers is clearly possible, by the most usual formulation of mathematical induction; but the scope of the method can include well-ordered induction of any kind.

  3. List of incomplete proofs - Wikipedia

    en.wikipedia.org/wiki/List_of_incomplete_proofs

    Then E. T. Parker found a counterexample of order 10 using a one-hour computer search. Finally Parker, Bose, and Shrikhande showed this conjecture to be false for all n ≥ 10. In 1798 A. M. Legendre claimed that 6 is not the sum of 2 rational cubes, [9] which as Lamé pointed out in 1865 is false as 6 = (37/21) 3 + (17/21) 3.

  4. Counterexample - Wikipedia

    en.wikipedia.org/wiki/Counterexample

    In logic a counterexample disproves the generalization, and does so rigorously in the fields of mathematics and philosophy. [1] For example, the fact that "student John Smith is not lazy" is a counterexample to the generalization "students are lazy", and both a counterexample to, and disproof of, the universal quantification "all students are ...

  5. Counterexamples in Topology - Wikipedia

    en.wikipedia.org/wiki/Counterexamples_in_Topology

    Counterexamples in Topology (1970, 2nd ed. 1978) is a book on mathematics by topologists Lynn Steen and J. Arthur Seebach, Jr.. In the process of working on problems like the metrization problem, topologists (including Steen and Seebach) have defined a wide variety of topological properties.

  6. Hilbert's fourteenth problem - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_fourteenth_problem

    The vector space V is a 13-dimensional vector space over k consisting of all vectors (b 1,...,b 16) in k 16 orthogonal to each of the three vectors (a 1i, ...,a 16i) for i=1, 2, 3. The vector space V is a 13-dimensional commutative unipotent algebraic group under addition, and its elements act on R by fixing all elements t j and taking x j to x ...

  7. Conway base 13 function - Wikipedia

    en.wikipedia.org/wiki/Conway_base_13_function

    The Conway base 13 function is a function created by British mathematician John H. Conway as a counterexample to the converse of the intermediate value theorem.In other words, it is a function that satisfies a particular intermediate-value property — on any interval (,), the function takes every value between () and () — but is not continuous.

  8. Stolz–Cesàro theorem - Wikipedia

    en.wikipedia.org/wiki/Stolz–Cesàro_theorem

    In mathematics, the Stolz–Cesàro theorem is a criterion for proving the convergence of a sequence.It is named after mathematicians Otto Stolz and Ernesto Cesàro, who stated and proved it for the first time.

  9. Carmichael's theorem - Wikipedia

    en.wikipedia.org/wiki/Carmichael's_theorem

    In number theory, Carmichael's theorem, named after the American mathematician R. D. Carmichael, states that, for any nondegenerate Lucas sequence of the first kind U n (P, Q) with relatively prime parameters P, Q and positive discriminant, an element U n with n ≠ 1, 2, 6 has at least one prime divisor that does not divide any earlier one except the 12th Fibonacci number F(12) = U 12 (1, − ...

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