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Re: Mathematica's FactorialSimplify command
 To: mathgroup at smc.vnet.net
 Subject: [mg8553] Re: Mathematica's FactorialSimplify command
 From: Paul Abbott <paul at physics.uwa.edu.au>
 Date: Sat, 6 Sep 1997 23:16:19 0400
 Organization: University of Western Australia
 Sender: ownerwrimathgroup at wolfram.com
Amy Calhoun wrote:
> I am trying to figure out how to use a Mathematica package that contains the
> command FactorialSimplify.
I assume then that this a version 2.2 package. The functionality of
FactorialSimplify has been absorbed into FullSimplify (or you can use
FunctionExpand):
In[1]:= FunctionExpand[(n + 1)!/(n  3)!]
Out[1]= (n  2) (n  1) n (n + 1)
In[2]:= FullSimplify[(n + 1)!/(n  3)!]
Out[2]= (n  2) (n  1) n (n + 1)
In[3]:= FunctionExpand[Gamma[n + 2]/(n  3)!]
Out[3]= (n  2) (n  1) n (n + 1)
In[4]:= FullSimplify[Gamma[n + 2]/(n  3)!]
Out[4]= (n  2) (n  1) n (n + 1)
In 3.0, if you replace all occurences of FactorialSimplify by
FunctionExpand it should work.
> In the book "A=B" there are several references to
> a Mathematica command called FactorialSimplify. The book says that the command
> can be found in the package DiscreteMath`RSolve`. I've loaded this package and
> I've not found the command, and the help command just returns that
> FactorialSimplify is a global variable.
You have probably already "referred" to FactorialSimplify (by entering
it before loading the package DiscreteMath`RSolve`). If you
To stick with the 2.2 you should load
Needs["DiscreteMath`RSolve`"]
before you call FactorialSimplify.
Cheers,
Paul
____________________________________________________________________
Paul Abbott Phone: +61893802734
Department of Physics Fax: +61893801014
The University of Western Australia
Nedlands WA 6907 mailto:paul at physics.uwa.edu.au
AUSTRALIA http://www.pd.uwa.edu.au/Paul
God IS a weakly lefthanded dice player
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