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  2. Discriminant - Wikipedia

    en.wikipedia.org/wiki/Discriminant

    Over the real numbers, a discriminant is equivalent to −1, 0, or 1. Over the rational numbers , a discriminant is equivalent to a unique square-free integer . By a theorem of Jacobi , a quadratic form over a field of characteristic different from 2 can be expressed, after a linear change of variables, in diagonal form as

  3. Discriminant of an algebraic number field - Wikipedia

    en.wikipedia.org/wiki/Discriminant_of_an...

    The discriminant of K is 49 = 7 2. Accordingly, the volume of the fundamental domain is 7 and K is only ramified at 7. In mathematics, the discriminant of an algebraic number field is a numerical invariant that, loosely speaking, measures the size of the (ring of integers of the) algebraic number field.

  4. Different ideal - Wikipedia

    en.wikipedia.org/wiki/Different_ideal

    Its discriminant as quadratic form need not be +1 (in fact this happens only for the case K = Q). Define the inverse different or codifferent [ 3 ] [ 4 ] or Dedekind's complementary module [ 5 ] as the set I of x ∈ K such that tr( xy ) is an integer for all y in O K , then I is a fractional ideal of K containing O K .

  5. 10 Hard Math Problems That Even the Smartest People in the ...

    www.aol.com/10-hard-math-problems-even-150000090...

    For example, if s=2, then 𝜁(s) is the well-known series 1 + 1/4 + 1/9 + 1/16 + …, which strangely adds up to exactly 𝜋²/6. When s is a complex number—one that looks like a+b𝑖, using ...

  6. Eisenstein's criterion - Wikipedia

    en.wikipedia.org/wiki/Eisenstein's_criterion

    These can be found in terms of the discriminant of Q. For example, in the case x 2 + x + 2 given above, the discriminant is −7 so that 7 is the only prime that has a chance of making it satisfy the criterion. Modulo 7, it becomes (x − 3) 2 — a repeated root is inevitable, since the discriminant is 0 mod 7. Therefore the variable shift is ...

  7. Quadratic field - Wikipedia

    en.wikipedia.org/wiki/Quadratic_field

    The following table shows some orders of small discriminant of quadratic fields. The maximal order of an algebraic number field is its ring of integers, and the discriminant of the maximal order is the discriminant of the field. The discriminant of a non-maximal order is the product of the discriminant of the corresponding maximal order by the ...

  8. Szpiro's conjecture - Wikipedia

    en.wikipedia.org/wiki/Szpiro's_conjecture

    Szpiro's conjecture and its equivalent forms have been described as "the most important unsolved problem in Diophantine analysis" by Dorian Goldfeld, [1] in part to its large number of consequences in number theory including Roth's theorem, the Mordell conjecture, the Fermat–Catalan conjecture, and Brocard's problem.

  9. Richard G. Tilghman - Pay Pals - The Huffington Post

    data.huffingtonpost.com/paypals/richard-g-tilghman

    From January 2008 to December 2012, if you bought shares in companies when Richard G. Tilghman joined the board, and sold them when he left, you would have a 1.4 percent return on your investment, compared to a -2.8 percent return from the S&P 500.

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