In algebraic number theory, a Gauss sum or Gaussian sum is a particular kind of finite sum of roots of unity, typically
- G(χ):=G(χ,ψ)=∑χ(r)⋅ψ(r){displaystyle G(chi ):=G(chi ,psi )=sum chi (r)cdot psi (r)}
where the sum is over elements r of some finitecommutative ringR, ψ is a group homomorphism of the additive groupR+ into the unit circle, and χ is a group homomorphism of the unit groupR× into the unit circle, extended to non-unit r Free train games for pc. , where it takes the value 0. Gauss sums are the analogues for finite fields of the Gamma function.[clarification needed]
Such sums are ubiquitous in number theory. They occur, for example, in the functional equations of Dirichlet L-functions, where for a Dirichlet characterχ the equation relating L(s, χ) and L(1 − s, χ) (where χ is the complex conjugate of χ) involves a factor[clarification needed]
Gauss sum 2.2.5 free download. Games downloads - GaussSum by Noel O'Boyle and many more programs are available for instant and free download. For details, see: A.R. ALLOUCHE, Gabedit - A graphical user interface for computational chemistry softwares, Journal of Computational Chemistry, 32 (2011) 174-182.DOI: 10.1002/jcc.21600. Gaussian 16 Installation Instructions for Mac OS X In order to run Gaussian 16, several UNIX environment variables must be set in each user's account. If you are comfortable using UNIX, Gaussian 16 can be set up using the normal instructions for binary UNIX systems. The following alternate instructions make minimal use of UNIX commands.
- G(χ)|G(χ)|.{displaystyle {frac {G(chi )}{|G(chi )|}}.}
History[edit]
The case originally considered by Carl Friedrich Gauss was the quadratic Gauss sum, for R the field of residuesmodulo a prime numberp, and χ the Legendre symbol. In this case Gauss proved that G(χ) = p1⁄2 or ip1⁄2 for p congruent to 1 or 3 modulo 4 respectively (the quadratic Gauss sum can also be evaluated by Fourier analysis as well as by contour integration).
An alternate form for this Gauss sum is:
- ∑e2πir2p{displaystyle sum e^{frac {2pi ir^{2}}{p}}}
Quadratic Gauss sums are closely connected with the theory of theta functions.
The general theory of Gauss sums was developed in the early 19th century, with the use of Jacobi sums and their prime decomposition in cyclotomic fields. Gauss sums over a residue ring of integers mod N are linear combinations of closely related sums called Gaussian periods.
The absolute value of Gauss sums is usually found as an application of Plancherel's theorem on finite groups. In the case where R is a field of p elements and χ is nontrivial, the absolute value is p1⁄2. The determination of the exact value of general Gauss sums, following the result of Gauss on the quadratic case, is a long-standing issue. For some cases see Kummer sum.
Properties of Gauss sums of Dirichlet characters[edit]
https://ruggdesqmume1977.wixsite.com/downloadclicks/post/call-of-duty-ghosts-free-games-to-play. The Gauss sum of a Dirichlet character modulo N is
- G(χ)=∑a=1Nχ(a)e2πiaN.{displaystyle G(chi )=sum _{a=1}^{N}chi (a)e^{frac {2pi ia}{N}}.}
If χ is also primitive, then
- |G(χ)|=N,{displaystyle |G(chi )|={sqrt {N}},}
in particular, it is nonzero. More generally, if N0 is the conductor of χ and χ0 is the primitive Dirichlet character modulo N0 that induces χ, then the Gauss sum of χ is related to that of χ0 by
- G(χ)=μ(NN0)χ0(NN0)G(χ0){displaystyle G(chi )=mu left({frac {N}{N_{0}}}right)chi _{0}left({frac {N}{N_{0}}}right)Gleft(chi _{0}right)}
where μ is the Möbius function. Consequently, G(χ) is non-zero precisely when N/N0 is squarefree and relatively prime to N0.
Other relations between G(χ) and Gauss sums of other characters include
- G(χ¯)=χ(−1)G(χ)¯,{displaystyle G({overline {chi }})=chi (-1){overline {G(chi )}},}
where χ is the complex conjugate Dirichlet character, and if χ′ is a Dirichlet character modulo N′ such that N and N′ are relatively prime, then
- G(χχ′)=χ(N′)χ′(N)G(χ)G(χ′).{displaystyle Gleft(chi chi ^{prime }right)=chi left(N^{prime }right)chi ^{prime }(N)G(chi )Gleft(chi ^{prime }right).}
The relation among G(χχ′), G(χ), and G(χ′) when χ and χ′ are of the same modulus (and χχ′ is primitive) is measured by the Jacobi sumJ(χ, χ′). Specifically,
- G(χχ′)=G(χ)G(χ′)J(χ,χ′).{displaystyle Gleft(chi chi ^{prime }right)={frac {G(chi )Gleft(chi ^{prime }right)}{Jleft(chi ,chi ^{prime }right)}}.}
Further properties[edit]
- Gauss sums can be used to prove quadratic reciprocity, cubic reciprocity and quartic reciprocity
- Gauss sums can be used to calculate the number of solutions of polynomial equations over finite fields, and thus can be used to calculate certain zeta functions
See also[edit]
References[edit]
- Apostol, Tom M. (1976), Introduction to analytic number theory, Undergraduate Texts in Mathematics, New York-Heidelberg: Springer-Verlag, ISBN978-0-387-90163-3, MR0434929, Zbl0335.10001
- Berndt, B. C.; Evans, R. J.; Williams, K. S. (1998). Gauss and Jacobi Sums. Canadian Mathematical Society Series of Monographs and Advanced Texts. Wiley. ISBN0-471-12807-4. Zbl0906.11001.
- Ireland, Kenneth; Rosen, Michael (1990). A Classical Introduction to Modern Number Theory. Graduate Texts in Mathematics. 84 (2nd ed.). Springer-Verlag. ISBN0-387-97329-X. Zbl0712.11001.
- Section 3.4 of Iwaniec, Henryk; Kowalski, Emmanuel (2004), Analytic number theory, American Mathematical Society Colloquium Publications, 53, Providence, RI: American Mathematical Society, ISBN978-0-8218-3633-0, MR2061214, Zbl1059.11001
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