Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Regional Enlarged Observability of Fractional Differential Equations
  with Riemann-Liouville Time Derivatives   We introduce the concept of regional enlarged observability for fractional
evolution differential equations involving Riemann-Liouville derivatives. The
Hilbert Uniqueness Method (HUM) is used to reconstruct the initial state
between two prescribed functions, in an interested subregion of the whole
domain, without the knowledge of the state.

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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex