Differential of a function: Difference between revisions

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In mathematics, the '''theta function of a lattice''' is a function whose coefficients give the number of vectors of a given norm.
 
==Definition==
One can associate to any (positive-definite) [[Lattice (discrete subgroup)|lattice]] Λ a [[theta function]] given by
 
:<math>\Theta_\Lambda(\tau) = \sum_{x\in\Lambda}e^{i\pi\tau\|x\|^2}\qquad\mathrm{Im}\,\tau > 0.</math>
 
The theta function of a [[Lattice (discrete subgroup)|lattice]] is then a [[holomorphic function]] on the [[upper half-plane]]. Furthermore, the theta function of an even [[unimodular lattice]] of rank&nbsp;''n'' is actually a [[modular form]] of weight&nbsp;''n''/2. The theta function of an integral lattice is often written as a power series in <math>q = e^{2i\pi\tau}</math> so that the coefficient of ''q''<sup>''n''</sup> gives the number of lattice vectors of norm&nbsp;2''n''.
 
==References==
*{{dlmf|id=21|title=Multidimensional Theta Functions|first=Bernard |last=Deconinck}}
 
[[Category:Number theory]]
[[Category:Special functions]]

Revision as of 16:45, 19 October 2013

In mathematics, the theta function of a lattice is a function whose coefficients give the number of vectors of a given norm.

Definition

One can associate to any (positive-definite) lattice Λ a theta function given by

ΘΛ(τ)=xΛeiπτx2Imτ>0.

The theta function of a lattice is then a holomorphic function on the upper half-plane. Furthermore, the theta function of an even unimodular lattice of rank n is actually a modular form of weight n/2. The theta function of an integral lattice is often written as a power series in q=e2iπτ so that the coefficient of qn gives the number of lattice vectors of norm 2n.

References