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MathGroup Archive 2005

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Re: FullSimplify again ...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg59178] Re: FullSimplify again ...
  • From: David Bailey <dave at Remove_Thisdbailey.co.uk>
  • Date: Sun, 31 Jul 2005 01:30:48 -0400 (EDT)
  • References: <dcf3d4$lgl$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Detlef Müller wrote:
> Hello.
> I happened to type the following lines:
> 
> 
> 
> In[15]:= f=FullSimplify[Product[(5-i)/5,{i,1,n}]]
> Out[15]= 0
> 
> In[17]:= Product[(5-i)/5,{i,1,n}]/.(n->4)
> Out[17]= 24/625
> 
> Strange, isn't it?
> 
> Version Number: 5.1.1.0
> Platform: X
> 
> Greetings,
>    Detlef
> 
By evaluating the product without FullSimplify, it would seem that this 
bug boils down to

Pochhammer[-4, n] // FullSimplify

This spuriously evaluates to 0.

David Bailey
http://www.dbaileyconsultancy.co.uk


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