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.
three
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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.
five
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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:
1
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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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