The change of coal thickness caused by geological structure is nonlinear and revulsion, but in a certain range, the mathematical expectation of coal thickness distribution is a fixed value.
由构造引起的煤厚变化具有非线性特征和突变性，但在一定的范围内，煤厚分布的数学期望为一个固定值。
When the market is complete, the present value of any derivative security is equivalent to mathematical expectation of its underlying profit discount value under equivalent martingale measurement.
当市场是完备时，任意衍生证券的现值等于该证券未来收益折现值在等价鞅测度下的数学期望。
Build mathematical model of quantitative analysis, confirm the expectation value of light intensity, build standard work curve, improving analysis precision.
建立定量分析数学模型，确定光强值，建立标准工作曲线，提高分析精度。
Optimal maintenance policy problem in a system is discussed and analysed in this paper. Due to the random variable concerned, one objective mathematical model of expectation value is developed.
本文讨论了系统的最优维修策略问题，考虑到题目中所涉及的变量大多为随机变量，我们建立了单目标的期望值模型。
Optimal maintenance policy problem in a system is discussed and analysed in this paper. Due to the random variable concerned, one objective mathematical model of expectation value is developed.
本文讨论了系统的最优维修策略问题，考虑到题目中所涉及的变量大多为随机变量，我们建立了单目标的期望值模型。
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