Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Estimates of Exponential Sums   This paper introduces a general technique for estimating the absolute value
of pure Gaussian sums of order k over a prime p for a class of composite order
k. The new estimate improves the classical estimate by a factor of about 2 or
better (depending on k) for all sufficiently large primes p.

23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess