滤子在现代数学中占有重要的位置。

Filter occupies an important place in modern mathematics.

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论文的第三部分是本文的核心内容，首先以实例解释了不完全信息的涵义，给出了不完全信息的数学表达式，定义了信息滤子。

Thirdly, this paper explains the meaning of incomplete information by occurrences and writes the mathematical expression of incomplete information and defines the information filtration.

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