Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A generalization of Matkowski's fixed point theorem and Istratescu's
  fixed point theorem concerning convex contractions   In this paper we obtain a generalization of Matkowski's fixed point theorem
and Istratescu's fixed point theorem concerning convex contractions in the
framework of b-metric spaces. By providing appropriate examples we show that
the above mentioned two generalizations are effective.

30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin