20101124, 14:58  #1 
Sep 2010
33_{8} Posts 
Gamma function
It would be much more elegant to define gamma(z) = z!, but mathematicians prefer gamma(z) = (z1)! and clutter a really beautiful improper integral with an awkwardly placed minus one.
Why? 
20101124, 22:07  #2 
"William"
May 2003
New Haven
938_{16} Posts 
Look up the integral definition of gamma. Something like this is necessary because Gamma is defined for reals (except negative integers). Your proposal would destroy the elegance of this definition. Your perception of elegance comes from only knowing the factorial correspondence. The gamma function has many other uses, and deserves elegance within its own domain.

20101125, 03:42  #3  
Aug 2006
5,939 Posts 
Quote:


20101125, 04:10  #4 
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
1000101110111_{2} Posts 
If you make gamma(z)=z! how would you distinguish it from factorial(z)?

20101125, 14:31  #5  
Sep 2010
3^{3} Posts 
Quote:
Egg, face, case in point. :) Any idea why they eventually did settle for the z1, instead of just plain z in the integral definition? 

20101207, 20:49  #6 
Dec 2008
you know...around...
2^{5}·19 Posts 
I asked myself the same question when I learned about that function, and was even more confused about psi(n) = (value of the harmonic series at n1)  0,5772156649... (the EulerMascheroniConstant).
But I always trusted that there is a just reason for it and tried to learn more about it. Am I wise, or what? 
20101223, 22:18  #7 
"Gang aft agley"
Sep 2002
2×1,877 Posts 

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
A useful function.  JM Montolio A  Miscellaneous Math  28  20180308 14:29 
Fun with partition function  Batalov  And now for something completely different  24  20180227 17:03 
phi function  rula  Homework Help  3  20170118 01:41 
Derivative of Gamma  nibble4bits  Math  0  20080108 05:53 
DR zeta function  devarajkandadai  Math  4  20071220 21:37 