Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Reconstruction and Prediction Algorithm of the Fractional TDD for
  the Local Outbreak of COVID-19   From late December, 2019, the novel Corona-Virus began to spread in the
mainland of China. For predicting the trend of the Corona Virus spread, several
time delay dynamic systems (TDD) are proposed. In this paper, we establish a
novel fractional time delay dynamic system (FTDD) to describe the local
outbreak of COVID-19. The fractional derivative is introduced to account for
the sub-diffusion process of the confirmed and cured peoples growth. Based on
the public health data by the government, we propose a stable reconstruction
algorithm of the coefficients. The reconstructed coefficients are used to
predict the trend of the Corona-Virus. The numerical results are in good
agreement with the public data.

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The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con