Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Krein's trace theorem revisited   We supply the first proof of Krein's Trace Theorem which does not use complex
analysis. Our proof holds for~$\sigma$-finite von Neumann algebras
$\mathcal{M}$ of type II and unbounded perturbations from the predual
of~$\mathcal{M}$.

37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph