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单词 Sigma notation
释义

Sigma notation

原声例句
可汗学院:统计学(视频版)

We've been dealing with these sigma notation variables and all that so far.

到目前为止,我们一直在处理这些 sigma 符号变量等等。

可汗学院:统计学(视频版)

And if you've done the calculus playlists already, sigma notation is really like a discrete integral on some level.

如果你已经完成了微积分播放列表,sigma 符号在某种程度上真的就像一个离散积分。

可汗学院:统计学(视频版)

And I think just by doing this we'll also get a little bit better intuition of just manipulating sigma notation, or even what it means.

而且我认为仅仅通过这样做,我们也会对操纵 sigma 符号甚至它的含义有更好的直觉。

可汗学院:统计学(视频版)

But if you think about it, this is the same thing as-- if you're not familiar with sigma notation this is a good thing to know in general, just a little bit of intuition.

但如果你仔细想想,这与——如果你不熟悉 sigma 符号, 一般来说这是一件好事, 只是一点点直觉。

中文百科

求和符号 Summation

(重定向自Sigma notation)

求和符号Σ,sigma),是欧拉于1755年首先使用的。这个符号是源于希腊文σογμαρω(增加)的字头,Σ正是σ的大写。求和的结果是给定的数值相加后的总值,又称加总

举例而言,若有4个数值:1、3、5、7,则这4个数值的总和为:

扩展为数学的一般式:

若有n个数值x1、x2、...、xn,则此n个数值的总和为:

上式的等号右段在数学上常简洁地写为:

英语百科

Summation 求和符号

(重定向自Sigma notation)
The capital sigma
Die Sigma-Schreibweise

In mathematics, summation (symbol: ) is the addition of a sequence of numbers; the result is their sum or total. If numbers are added sequentially from left to right, any intermediate result is a partial sum, prefix sum, or running total of the summation. The numbers to be summed (called addends, or sometimes summands) may be integers, rational numbers, real numbers, or complex numbers. Besides numbers, other types of values can be added as well: vectors, matrices, polynomials and, in general, elements of any additive group (or even monoid). For finite sequences of such elements, summation always produces a well-defined sum.

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更新时间:2025/6/19 7:27:25