product of two differential operators
product of two differential operators
两个微分算子的乘积
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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In this paper, we get the self-adjointness of the product operators generated by different two differential expressions by operator theory and matrix calculation.
此前对微分算子的积算子自伴的研究主要集中于由同一个对称微分算式生成的两个或多个微分算子积的自伴问题上，取得了一些成果。
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