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  2. Genus (mathematics) - Wikipedia

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

    The non-orientable genus, demigenus, or Euler genus of a connected, non-orientable closed surface is a positive integer representing the number of cross-caps attached to a sphere. Alternatively, it can be defined for a closed surface in terms of the Euler characteristic χ, via the relationship χ = 2 − k , where k is the non-orientable genus.

  3. Genus g surface - Wikipedia

    en.wikipedia.org/wiki/Genus_g_surface

    The genus (sometimes called the demigenus or Euler genus) of a connected non-orientable closed surface is a positive integer representing the number of cross-caps attached to a sphere. Alternatively, it can be defined for a closed surface in terms of the Euler characteristic χ, via the relationship χ = 2 − g, where g is the non-orientable ...

  4. List of topics named after Leonhard Euler - Wikipedia

    en.wikipedia.org/wiki/List_of_topics_named_after...

    Many of these items named after Euler include their own unique function, equation, formula, identity, number (single or sequence), or other mathematical entity. Many of these entities have been given simple yet ambiguous names such as Euler's function, Euler's equation, and Euler's formula.

  5. Contributions of Leonhard Euler to mathematics - Wikipedia

    en.wikipedia.org/wiki/Contributions_of_Leonhard...

    Euler invented the calculus of variations including its most well-known result, the Euler–Lagrange equation. Euler also pioneered the use of analytic methods to solve number theory problems. In doing so, he united two disparate branches of mathematics and introduced a new field of study, analytic number theory.

  6. Eisenstein integer - Wikipedia

    en.wikipedia.org/wiki/Eisenstein_integer

    Up to conjugacy and unit multiples, the primes listed above, together with 2 and 5, are all the Eisenstein primes of absolute value not exceeding 7. As of October 2023 [update] , the largest known real Eisenstein prime is the tenth-largest known prime 10223 × 2 31172165 + 1 , discovered by Péter Szabolcs and PrimeGrid . [ 5 ]

  7. College Football Playoff: Ranking the potential upsets in the ...

    www.aol.com/ranking-potential-upsets-college...

    The potential: Underachieving vs. unproven. Texas lost, twice, to the only team of note it played all season. Clemson backed its way into the ACC championship, then took advantage of an ...

  8. Euler diagram - Wikipedia

    en.wikipedia.org/wiki/Euler_diagram

    Euler diagrams consist of simple closed shapes in a two-dimensional plane that each depict a set or category. How or whether these shapes overlap demonstrates the relationships between the sets. Each curve divides the plane into two regions or "zones": the interior, which symbolically represents the elements of the set, and the exterior, which ...

  9. California man sentenced for 'birth tourism' scheme for ... - AOL

    www.aol.com/news/california-man-sentenced-birth...

    A Southern California man was sentenced Monday to more than three years in prison for operating a "birth tourism" scheme where affluent pregnant Chinese women paid thousands of dollars to travel ...

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