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