[Date Index] [Thread Index] [Author Index]

Re: LegendreP error (bug?) in Mathematica

• To: mathgroup at smc.vnet.net
• Subject: [mg58922] Re: LegendreP error (bug?) in Mathematica
• From: "symbio" <symbio at has.com>
• Date: Sun, 24 Jul 2005 01:21:45 -0400 (EDT)
• References: <dbq2o2$713$1@smc.vnet.net> <dbt3bk$sib$1@smc.vnet.net>
• Reply-to: "symbio" <symbio at sha.com>
• Sender: owner-wri-mathgroup at wolfram.com

Also,
In[51]:=
LegendreP[1, 1] - LegendreP[-1, 1] gives 0, when it should give 2. Becuase 
LegendreP[-1, 1] should equal to -1, not +1.  check it out in any math book!



"sashap" <pavlyk at gmail.com> wrote in message 
news:dbt3bk$sib$1 at smc.vnet.net...
> No, it is not a bug and Mathematica returns correct result:
>
> http://functions.wolfram.com/HypergeometricFunctions/LegendrePGeneral/04/02/01/0002/
>
> LegendreP[-n, z] == LegendreP[n- 1, z]
>
> LegendreP[-1,z] == LegendreP[0,z] == 1
>
> Your sum does not define LegendreP.
>