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  2. Zhuo Qun Song - Wikipedia

    en.wikipedia.org/wiki/Zhuo_Qun_Song

    Song was born in Tianjin, China in 1997. [1] He and his parents moved to Canada in 2002. [1] Song was brought up in Waterloo, Ontario. [2] [3]Song was interested in mathematics at a very young age where he started participating in competitions in first grade.

  3. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    The column headings may be clicked to sort the table alphabetically, by decimal value, or by set. ... [27] 0.66274 34193 49181 58097 [Mw 17] ... 10, 2, 1, 3, 2, ...

  4. Quartic equation - Wikipedia

    en.wikipedia.org/wiki/Quartic_equation

    Single Multiplicity-2 (SM2): when the general quartic equation can be expressed as () () =, where , , and are three different real numbers or is a real number and and are a couple of non-real complex conjugate numbers. This case is divided into two subcases, those that can be reduced to a biquadratic equation and those in which this is impossible.

  5. Root of unity - Wikipedia

    en.wikipedia.org/wiki/Root_of_unity

    For n = 5, 10, none of the non-real roots of unity (which satisfy a quartic equation) is a quadratic integer, but the sum z + z = 2 Re z of each root with its complex conjugate (also a 5th root of unity) is an element of the ring Z[⁠ 1 + √ 5 / 2 ⁠] (D = 5).

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  7. American Mathematics Competitions - Wikipedia

    en.wikipedia.org/wiki/American_Mathematics...

    the AMC 10, for students under the age of 17.5 and in grades 10 and below; the AMC 12, for students under the age of 19.5 and in grades 12 and below [2] The AMC 8 tests mathematics through the 8th grade curriculum. [1] Similarly, the AMC 10 and AMC 12 test mathematics through the 10th and 12th grade curriculum, respectively. [2]

  8. U.S. October budget deficit jumps to $257 billion, handing ...

    www.aol.com/news/u-october-budget-deficit-jumps...

    WASHINGTON (Reuters) -The U.S. budget deficit jumped nearly four-fold to $257 billion in October, a figure inflated by one-off factors, the Treasury Department said on Wednesday in a report that ...

  9. Relation (mathematics) - Wikipedia

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

    The relation "is a nontrivial divisor of " on the set of one-digit natural numbers is sufficiently small to be shown here: R dv = { (2,4), (2,6), (2,8), (3,6), (3,9), (4,8) }; for example 2 is a nontrivial divisor of 8, but not vice versa, hence (2,8) ∈ R dv, but (8,2) ∉ R dv. If R is a relation that holds for x and y one often writes xRy.