Gaussian function

In mathematics, there are two types of Euler integral:

1. Euler integral of the first kind: the Beta function

$\mathrm{B}(x,y)=\underset{0}{\overset{1}{\int }}{t}^{x-1}(1-t{)}^{y-1}dt=\frac{\mathrm{\Gamma }(x)\mathrm{\Gamma }(y)}{\mathrm{\Gamma }(x+y)}$

2. Euler integral of the second kind: the Gamma function

$\mathrm{\Gamma }(z)=\underset{0}{\overset{\mathrm{\infty }}{\int }}{t}^{z-1}{e}^{-t}dt$

For positive integers m and n

$\mathrm{B}(n,m)=\frac{(n-1)!(m-1)!}{(n+m-1)!}=\frac{n+m}{nm(\genfrac{}{}{0ex}{}{n+m}{n})}$

$\mathrm{\Gamma }(n)=(n-1)!$

See also

• Euler integral (thermodynamics)
• Leonhard Euler
• List of topics named after Leonhard Euler

References

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