The history and results of over forty years of research on the theory of reduced density matrices is discussed, and several key unsolved research problems announced. (C) 2001 John Wiley & Sons, Inc. [References: 22]
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机译：讨论了关于密度矩阵理论四十多年研究的历史和成果，并宣布了一些尚未解决的关键研究问题。 （C）2001 John Wiley＆Sons，Inc. [参考：22]
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