Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Estimates for spectral density functions of matrices over C[Z^d]   We give a polynomial bound on the spectral density function of a matrix over
the complex group ring of Z^d. It yields an explicit lower bound on the
Novikov-Shubin invariant associated to this matrix showing in particular that
the Novikov-Shubin invariant is larger than zero.

18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg