Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A time-frequency density criterion for operator identification   We establish a necessary density criterion for the identifiability of
time-frequency structured classes of Hilbert-Schmidt operators. The density
condition is based on the density criterion for Gabor frames and Riesz bases in
the space of square integrable functions. We complement our findings with
examples of identifiable operator classes.

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The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: nlin