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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. 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.

  4. List of topics named after Leonhard Euler - Wikipedia

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

    Euler's partition theorem relating the product and series representations of the Euler function Π(1 − x n) Goldbach–Euler theorem, stating that sum of 1/(k − 1), where k ranges over positive integers of the form m n for m ≥ 2 and n ≥ 2, equals 1; Gram–Euler theorem

  5. 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 ...

  6. The biggest Supreme Court decisions of 2024: From ... - AOL

    www.aol.com/biggest-supreme-court-decisions-2024...

    The Supreme Court on July 1, 2024, kept on hold efforts by Texas and Florida to limit how Facebook, TikTok, X, YouTube and other social media platforms regulate content in a ruling that strongly ...

  7. Introductio in analysin infinitorum - Wikipedia

    en.wikipedia.org/wiki/Introductio_in_analysin...

    Euler's number e corresponds to shaded area equal to 1, introduced in chapter VII. Introductio in analysin infinitorum (Latin: [1] Introduction to the Analysis of the Infinite) is a two-volume work by Leonhard Euler which lays the foundations of mathematical analysis.

  8. Jennifer Love Hewitt Is 'Proud' of 11-Year Marriage to Brian ...

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    Jennifer Love Hewitt is relishing a recent milestone.. On Nov. 21, the 9-1-1 actress, 45, and her husband, actor Brian Hallisay, celebrated 11 years of marriage. "That's like 190 years in ...

  9. Pregnant Princess Sofia of Sweden Says of Milestone 40th ...

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    JONATHAN NACKSTRAND/AFP via Getty Princess Sofia of Sweden attends the royal banquet to honour the laureates of the Nobel Prize 2019 following the Award ceremony on Dec. 10, 2022