These are mathematical signs.

这些是数学符号。

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Mathematics language includes characters, mathematical signs, charts and images. The language is characterized by logicality, simplicity, accuracy and situation.

数学语言包括文字语言、符号语言和图表(象)语言，具有逻辑性、简约性、精确性、情境性等特点。

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In the fault diagnosis of power plant, the precise mathematical model of the object is difficult to be obtained. And there are some fuzziness between fault signs and fault reasons.

在火电厂故障诊断中，难以建立对象的精确数学模型，且故障征兆和故障原因之间具有一定的模糊性。

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