Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Existence of mild solutions for Riemann-Liouville fractional
  differential equations with nonlocal conditions   In this paper, we are concerned with the mild solutions of Riemann-Liouville
fractional differential equations with nonlocal conditions in Banach space. We
use Banach contraction principle to prove the existence and uniqueness.
Moreover, we derive the existence by using Krasnoselkii's theorem. An
illustrative example is presented.

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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: q-alg
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The categories of this paper are: physics