数字很大的数,一般我们可以用E数表示,例如6230000000000;我们可以用6.23E12表示,而它表示的是将6.23×10^12 E数形式6.23E12,代表将数字6.23中6后面的小数点向右移去12位。
And, that's equal to the product of e the proton number times e.
正等价于,质子数乘以。
n l So negative e, which is sub n l, because it's a function of n and l in terms of quantum numbers.
也就是负的,E,下标是,因为它是一个,关于量子数,n,和,l,的函数。
The basic definition-- the expected value of some random variable x--E--I guess I should have said that a random variable is a quantity that takes on value.
最基本的定义,某一个随机变量X的期望值E,我应该提到过,随机变量是一个可以取值的数
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