Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solution of Linear Fractional Systems with Variable Coefficients   The paper deals with the initial value problem for linear systems of FDEs
with variable coefficients involving Riemann--Liouville and Caputo derivatives.
The technique of the generalized Peano--Baker series is used to obtain the
state-transition matrix. Explicit solutions are derived both in the homogeneous
and inhomogeneous case. The theoretical results are supported by examples.

17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys