The embedded derivative instruments and the principal contract jointly form into a mixed instrument, e. g., the convertible company bonds, etc.

嵌入衍生工具与主合同构成混合工具，如可转换公司债券等。

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Methods the upper-lower solutions, monotone derivative methods, the maximum principle, comparison principle and principal eigenvalue theory were used.

方法采用上下解的方法、单调迭代法、比较原理、极值原理以及特征值理论进行了研究。

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