| 随机变量数学期望存在性的若干判定条件 |
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| 引用本文： | 彭玉兵.随机变量数学期望存在性的若干判定条件[J].赣南师范学院学报,2009,30(6):26-28. |
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| 作者姓名： | 彭玉兵 |
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| 作者单位： | 赣南师范学院,数学与计算机科学学院,江西,赣州,341000 |
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| 摘 要： | 研究随机变量数学期望存在的条件．主要根据放缩法和积分区域变换法研究．得出了几个较实用的判断条件，对数学期望存在性判断问题，可以根据不同问题选择不同的方法，这样可起到事半功倍的效果．
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| 关 键 词： | 随机变量 数学期望 存在性 放缩 |
Some Existence Conditions about Mathematical Expectations of Random Variables |
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| PENG Yu-bing.Some Existence Conditions about Mathematical Expectations of Random Variables[J].Journal of Gannan Teachers' College(Social Science(2)),2009,30(6):26-28. |
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| Authors: | PENG Yu-bing |
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| Institution: | PENG Yu-bing (School of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, China) |
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| Abstract: | In this paper,we use method of scaling and method of integral regions transform to study existence conditions about mathematical expectation of a random variable.Several useful determine conditions are obtained.In practical application we can choose different methods according to different issues,so that it can play a multipier effect. |
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| Keywords: | random variable mathematical expectation existence scaling |
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