The definition of adjoint pair and equivalent condition are discussed. A sufficient condition of adjoint pair is improved.

讨论伴随对定义及其等价条件，改进伴随对存在的一个充分条件。

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First, it is discussed that the definition of adjoint pair and its equivalent condition, the sufficient condition of existence of adjoint pair is given.

先讨论伴随对定义及其等价条件，给出伴随对存在的一个充分条件；

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First, it is discussed that the definition of adjoint pair and its equivalent condition, the sufficient condition of existence of adjoint pair is given.

先讨论伴随对定义及其等价条件，给出伴随对存在的一个充分条件；

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