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How to write Sigma?
How to write sigma? We will learn the mathematical symbol sigma at school. We should have forgotten that we have entered the society now. So Bian Xiao will take you back to how Sigma is used.

Mathematical Sigma of Tool Raw Materials

Methods/Steps Step by Step Reading

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First of all, we need to know Sigma (capital σ, lowercase σ, Chinese transliteration: Sigma), a mathematical summation symbol (also called sum sign).

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For example: σ an = a 1+a2+...+ An

∑ is a simple symbol of the summation path of a series, followed by k 2, a general term formula, the following k= 1 is the number of terms at the beginning of the initial term, and the above n is the number of terms at the end.

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n

∑ k 2 = 1 2+2+ ... Version+n 2 (1)

k= 1

n

∑(2k+ 1)= 3+5+……+(2n+ 1)(2)

k= 1

Then (1)+(2)= 1

n

∑(k+ 1)^2=2^2+3^2+……+(n+ 1)^2

k= 1

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The extension of the famous binomial theorem can be expressed as

n

∑C(n,k)a^(n-k)b^k.

k=0

This shows that its application is quite flexible.

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Lowercase σ is used for statistical standard deviation, с of Cyrillic letter and S of Latin letter are both evolutionary versions of Sigma, and the generation right of Sigma, the villain of Rockman X series, also refers to summation.

Summary:

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1. First of all, we need to know Sigma (capital σ, lowercase σ, Chinese transliteration: Sigma).

2, sigma mathematical summation symbol.

3, lowercase σ is used for statistical standard deviation.

Matters needing attention

The symbol itself is a summation symbol.

The с channel of Cyrillic alphabet and the S of Latin alphabet are all evolved from Sigma.

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