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  2. Pseudomathematics - Wikipedia

    en.wikipedia.org/wiki/Pseudomathematics

    Pseudomathematics, or mathematical crankery, is a mathematics-like activity that does not adhere to the framework of rigor of formal mathematical practice. Common areas of pseudomathematics are solutions of problems proved to be unsolvable or recognized as extremely hard by experts, as well as attempts to apply mathematics to non-quantifiable ...

  3. Pseudoanalytic function - Wikipedia

    en.wikipedia.org/wiki/Pseudoanalytic_function

    In mathematics, pseudoanalytic functions are functions introduced by Lipman Bers (1950, 1951, 1953, 1956) that generalize analytic functions and satisfy a weakened form of the Cauchy–Riemann equations.

  4. Pseudometric space - Wikipedia

    en.wikipedia.org/wiki/Pseudometric_space

    In mathematics, a pseudometric space is a generalization of a metric space in which the distance between two distinct points can be zero. Pseudometric spaces were introduced by Đuro Kurepa [1] [2] in 1934.

  5. Pseudo-differential operator - Wikipedia

    en.wikipedia.org/wiki/Pseudo-differential_operator

    In mathematical analysis a pseudo-differential operator is an extension of the concept of differential operator. Pseudo-differential operators are used extensively in the theory of partial differential equations and quantum field theory, e.g. in mathematical models that include ultrametric pseudo-differential equations in a non-Archimedean space.

  6. Pseudo-reductive group - Wikipedia

    en.wikipedia.org/wiki/Pseudo-reductive_group

    Suppose that k is a non-perfect field of characteristic 2, and a is an element of k that is not a square. Let G be the group of nonzero elements x + y √ a in k[√ a].There is a morphism from G to the multiplicative group G m taking x + y √ a to its norm x 2 – ay 2, and the kernel is the subgroup of elements of norm 1.

  7. Category:Pseudomathematics - Wikipedia

    en.wikipedia.org/wiki/Category:Pseudomathematics

    This page was last edited on 4 November 2020, at 07:59 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  8. Pseudoscalar - Wikipedia

    en.wikipedia.org/wiki/Pseudoscalar

    In linear algebra, a pseudoscalar is a quantity that behaves like a scalar, except that it changes sign under a parity inversion [1] [2] while a true scalar does not.. A pseudoscalar, when multiplied by an ordinary vector, becomes a pseudovector (or axial vector); a similar construction creates the pseudotensor.

  9. Pseudomanifold - Wikipedia

    en.wikipedia.org/wiki/Pseudomanifold

    A pseudomanifold can be regarded as a combinatorial realisation of the general idea of a manifold with singularities. The concepts of orientability, orientation and degree of a mapping make sense for pseudomanifolds and moreover, within the combinatorial approach, pseudomanifolds form the natural domain of definition for these concepts.