Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inevitable irreversibility in a quantum system consisting of many
  non-interacting ``small'' pieces   We review the recent result of Sato, Sekimoto, Hondou, and Takagi
(cond-mat/0008393) on the irreversibility inevitably observed in systems
consisting of many non-interacting ``small'' pieces. We focus on quantum
models, and supply an explicit lower bound for the work required to complete a
cyclic process.

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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: physics
2
The categories of this paper are: math
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: eess