Simplifying Gamma(xy) Expression - Help Appreciated

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Discussion Overview

The discussion centers around the simplification of the expression \(\Gamma(xy)\) in terms of the gamma function and potentially other functions. Participants explore various approaches to manipulate the expression and seek alternative forms, while clarifying the context of their inquiry as related to research rather than homework.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant presents the integral definition of \(\Gamma(xy)\) and attempts a substitution to manipulate the expression, but encounters difficulties.
  • Another participant emphasizes the importance of showing work and suggests that assistance can be provided to overcome specific challenges.
  • A participant references the Gauss multiplication formula but notes its limitation when neither \(x\) nor \(y\) is an integer.
  • Further discussion questions the meaning of "simplify" and suggests that invoking identities may complicate the expression rather than clarify it.
  • One participant expresses a desire for any form that separates the argument \(xy\), regardless of complexity.
  • A later reply mentions the infinite product definitions for gamma and beta functions, indicating that they are defined in a broad context within the complex plane.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the simplification of \(\Gamma(xy)\), with multiple competing views and approaches presented throughout the discussion.

Contextual Notes

There are limitations regarding the assumptions made about the values of \(x\) and \(y\), particularly concerning the applicability of certain formulas like the Gauss multiplication theorem. The discussion also reflects uncertainty about the definition of "simplification" in this context.

mmzaj
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what is the simplification of the following expression (in terms of gamma and\or other functions) ?

\Gamma(xy)

i tried the following :

\Gamma(xy)=\int^{\infty}_{0} t^{xy-1} e^{-t} dt

now let t^x = s

=> ( after some manipulation )

\Gamma(xy)=\frac{1}{x}\int^{\infty}_{0} s^{y-1} exp{-s^\frac{1}{x}} ds

but here is where I'm stuck .. so any help would be appreciated ..
 
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What do you think it is? We don't do your homework here. You have to show us your work and we help you get past difficulties.
 
u r absolutely right , my bad ! by the way , it's not a H.W , it's for a research !
 
thanx , i was aware of qauss multiplication theorem , but it constrains either x or y to be an integer , while I'm looking for the case where neither is !
 
How could you simplify \Gamma (xy) further?? What do you mean by simplify if that's not good enough for you? Any identity that you can invoke will just make it more complicated. Is there something specific you had in mind?
 
yup , what i meant is separating (xy) , any other form - regardless of it's complexity - that separates (xy) as an argument is good enough .
 
You are not likely to find it, but I looked and I would not have been deterred by such a statement...

A good reference for formulas is http://functions.wolfram.com, in particular the gamma function (Use the 'PDF file' link on the left-hand plane,) and related functions.

The infinite product definitions for the gamma and beta functions are defined everywhere the functions can be defined (most of the complex plane, e.g. for the gamma function in complex plane less the non-negative integers.)
 
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