Gamma Function: Definition & Properties

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SUMMARY

The Gamma function is defined as Gamma(z) = ∫(0 to ∞) t^(z-1)e^(-t) dt. In this integral, 't' serves as the variable of integration, while 'z' is a parameter that determines the shape of the function. The integrand f(z,t) = t^(z-1)e^(-t) is a function of both 'z' and 't', but upon integration over the t-domain, the result is solely a function of 'z'. This understanding clarifies the relationship between the variables in the Gamma function.

PREREQUISITES
  • Understanding of integral calculus
  • Familiarity with exponential functions
  • Knowledge of complex variables
  • Basic concepts of special functions in mathematics
NEXT STEPS
  • Study the properties of the Gamma function, including its recurrence relation
  • Explore the relationship between the Gamma function and factorials
  • Learn about the Beta function and its connection to the Gamma function
  • Investigate applications of the Gamma function in probability and statistics
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Mathematicians, students studying calculus and complex analysis, and professionals working in fields that utilize special functions, such as physics and engineering.

Tiiba
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The definition of this function is
Gamma(z) = integral(0, inf)(t^(z-1)e^(-t) dt)

Well, I can't understand what the t stands for. The only parameter is z... Is it an arbitrary number?
 
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Your integrand is a function of TWO variables:
[tex]f(z,t)=t^{z-1}e^{-t}[/tex]
When you integrate f(z,t) over the t-domain, ([tex]0\leq{t}<\infty[/tex]) , what you are left with, is a function of z alone:
[tex]\Gamma(z)=\int_{0}^{\infty}f(z,t)dt[/tex]
 
I think I get it. Thanks.
 

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