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In number theory, a branch of mathematics, Ramanujan's ternary quadratic form is the algebraic expression x 2 + y 2 + 10z 2 with integral values for x, y and z. [ 1 ] [ 2 ] Srinivasa Ramanujan considered this expression in a footnote in a paper [ 3 ] published in 1916 and briefly discussed the representability of integers in this form.
A mapping q : M → R : v ↦ b(v, v) is the associated quadratic form of b, and B : M × M → R : (u, v) ↦ q(u + v) − q(u) − q(v) is the polar form of q. A quadratic form q : M → R may be characterized in the following equivalent ways: There exists an R-bilinear form b : M × M → R such that q(v) is the associated quadratic form.
The catalecticant of a ternary quartic is the resultant of its 6 second partial derivatives. It vanishes when the ternary quartic can be written as a sum of five 4th powers of linear forms. See also
Pages in category "Quadratic forms" ... Generalized Clifford algebra; Genus of a quadratic form; ... Ramanujan's ternary quadratic form; S. Signature (topology) ...
A quadratic form with integer coefficients is called an integral binary quadratic form, often abbreviated to binary quadratic form. This article is entirely devoted to integral binary quadratic forms. This choice is motivated by their status as the driving force behind the development of algebraic number theory.
Gauss contributed to solving the Kepler conjecture in 1831 with the proof that a greatest packing density of spheres in the three-dimensional space is given when the centres of the spheres form a cubic face-centred arrangement, [127] when he reviewed a book of Ludwig August Seeber on the theory of reduction of positive ternary quadratic forms ...
In this usage, only the fractional part of the number is written in ternary form. [2] [3] Ternary numbers can be used to convey self-similar structures like the Sierpinski triangle or the Cantor set conveniently. Additionally, it turns out that the ternary representation is useful for defining the Cantor set and related point sets, because of ...
The Hasse principle for orthogonal groups is closely related to the Hasse principle for the corresponding quadratic forms. Kneser (1966) and several others verified the Hasse principle by case-by-case proofs for each group. The last case was the group E 8 which was only completed by Chernousov (1989) many years after the other cases.
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