Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On modular signs   We consider some questions related to the signs of Hecke eigenvalues or
Fourier coefficients of classical modular forms. One problem is to determine to
what extent those signs, for suitable sets of primes, determine uniquely the
modular form, and we give both individual and statistical results. The second
problem, which has been considered by a number of authors, is to determine the
size, in terms of the conductor and weight, of the first sign-change of Hecke
eigenvalues. Here we improve significantly the recent estimate of Iwaniec,
Kohnen and Sengupta.

19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat