second moment是什么意思，查了下说是二阶
编辑： admin 2017-03-03
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数学中矩的概念来自于物理学.在物理学中,矩是用来表示物体形状的物理量.矩是用于物体形状识别的重要参数指标.
In mathematics,the second moment method is a technique used in probability theory and analysis to show that a random variable has positive probability of being positive.More generally,the "moment method" consists of bounding the probability that a random variable fluctuates far from its mean,by using its moments.[1]
The method is often quantitative,in that one can often deduce a lower bound on the probability that the random variable is larger than some constant times its expectation.The method involves comparing the second moment of random variables to the square of the first momen
类似问题
类似问题1：give a moment give a secondgive a moment give a secon请教这两个的区别?
二者都是给点时间的意思,give a moment 可能是时间多一点,give a seconds可能是时间少一点吧,比较急的.
类似问题2：second polar moment of area是什么意思
second polar moment of area
第二区的极矩
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类似问题3：the second ,the minute,the moment.怎么用....举几个例子.说详细点儿.
the second 这一秒
the minute 这一分钟
the moment 这一刻（不是15分钟的一刻,就是这一瞬间的这一刻）
很清楚了,我也不举例了……
类似问题4：second moment of
second moment of area
截面惯性矩；[数] 断面二次矩
类似问题5：second 和moment的区别两者都表示"片刻"时的区别[历史科目]
我认为前者表示一个瞬间,后者表示一个特定的时间段.