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  2. Section sign - Wikipedia

    en.wikipedia.org/wiki/Section_sign

    The section sign ( §) is a typographical character for referencing individually numbered sections of a document; it is frequently used when citing sections of a legal code. [1] It is also known as the section symbol, section mark, double-s, or silcrow. [2] [3] In other languages it may be called the "paragraph symbol" (for example, German ...

  3. Möbius–Hückel concept - Wikipedia

    en.wikipedia.org/wiki/Möbius–Hückel_concept

    In contrast to the Woodward–Hoffmann approach the Möbius–Hückel treatment is not dependent on symmetry and only requires counting the number of plus-signminus-sign inversions in proceeding around the cyclic array of orbitals. Where one has zero or an even number of sign inversions there is a Hückel array.

  4. Descartes' rule of signs - Wikipedia

    en.wikipedia.org/wiki/Descartes'_rule_of_signs

    Descartes' rule of signs. In mathematics, Descartes' rule of signs, first described by René Descartes in his work La Géométrie, is a technique for getting information on the number of positive real roots of a polynomial. It asserts that the number of positive roots is at most the number of sign changes in the sequence of polynomial's ...

  5. Check mark - Wikipedia

    en.wikipedia.org/wiki/Check_mark

    A check or check mark ( American English ), checkmark ( Philippine English ), tickmark ( Indian English) or tick ( Australian, New Zealand and British English) is a mark ( , , etc.) used in many countries, including the English-speaking world, to indicate the concept "yes" (e.g. "yes; this has been verified", "yes; that is the correct answer ...

  6. Henricus Grammateus - Wikipedia

    en.wikipedia.org/wiki/Henricus_Grammateus

    Henricus Grammateus (also known as Henricus Scriptor, Heinrich Schreyber or Heinrich Schreiber; 1495 – 1525 or 1526 [1]) was a German mathematician. He was born in Erfurt. In 1507 he started to study at the University of Vienna, where he subsequently taught. Christoph Rudolff was one of his students. From 1514 to 1517 he studied in Kraków ...

  7. Table of mathematical symbols by introduction date - Wikipedia

    en.wikipedia.org/wiki/Table_of_mathematical...

    integral sign. : colon (for division ) 1684 (deriving from use of colon to denote fractions, dating back to 1633) ·. middle dot (for multiplication ) 1698 (perhaps deriving from a much earlier use of middle dot to separate juxtaposed numbers) ⁄. division slash (a.k.a. solidus )

  8. Plus–minus - Wikipedia

    en.wikipedia.org/wiki/Plus-minus (disambiguation)

    Plus–minus sign (±), a mathematical symbol which can mean either plus (+) or minus (−), or can indicate the uncertainty of a measurement or statistic. Plus–minus (sports), a sports statistic used to measure a player's impact on the game. Plus minus method, a geophysical method to interpret seismic refraction profiles.

  9. Minus (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Minus_(disambiguation)

    Minus refers to the minus sign, a mathematical symbol. Minus may also refer to: Minus (record label) (also "m_nus"), a Canadian record label; minus, a webcomic; Mínus, an Icelandic band; Minus, a 2008 album by Dukes of Windsor "Minus", a 1996 song by Beck from Odelay "Minus", a 2002 song by In Flames from Reroute to Remain