Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fractional differential equations with mixed boundary conditions   In this paper, we discuss the existence and uniqueness of solutions of a
boundary value problem for a fractional differential equation of order
$\alpha\in(2,3)$, involving a general form of fractional derivative. First, we
prove an equivalence between the Cauchy problem and the Volterra equation.
Then, two results on the existence of solutions are proven, and we end with
some illustrative examples.

37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
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The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an