# Tagged Questions

**9**

votes

**1**answer

463 views

### Niemeier lattices and theta functions

I have an extremely elementary question. Let's say someone randomly hands you a theta function associated to a Niemeier lattice (unimodular even, n=24). What can you say about which Niemeier lattice ...

**4**

votes

**2**answers

581 views

### Is there any literature on multivariable theta functions?

The theta function of a lattice is defined to be
$$ \vartheta_\Lambda = \sum_{v\in\Lambda} q^{{\Vert v\Vert}^2}$$
which yields as a coefficient of qk the number of vectors of norm-squared k.
On the ...

**2**

votes

**1**answer

619 views

### Theta Functions and Cousins

So I am (barely) familiar with the construction of the theta function of an integral lattice $L$. The theta function, as I understand it, is defined as the function which takes a variable $z$ and ...