Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A discretization of the Hadamard fractional derivative   We present a new discretization for the Hadamard fractional derivative, that
simplifies the computations. We then apply the method to solve a fractional
differential equation and a fractional variational problem with dependence on
the Hadamard fractional derivative.

3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
19
The categories of this paper are: eess
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph