MathGroup Archive 2005

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

Search the Archive

Re: LegendreP of order = -1

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58963] Re: [mg58936] LegendreP of order = -1
  • From: Curtis Osterhoudt <gardyloo at mail.wsu.edu>
  • Date: Mon, 25 Jul 2005 01:12:18 -0400 (EDT)
  • References: <200507240521.BAA14443@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Symbio,

   A contour integration argument shows that, for any integral value of
n (see, e.g., Byron and Fuller's Mathematics of Classical and Quantum
Physics, section 6.9, and recasting into Mathematica's notation),

           LegendreP[ n, 1] = 1;
           LegendreP[ n, -1] = (-1)^n.

Mathematica gets it right.

              C.O.



   

symbio wrote:

>Hi,
>I'm trying to solve an electrodynamics problem in spherical coordinates and 
>need to use Legendre Polynomials.  Can anyone tell me what is the correct 
>mathematical value for LegendreP[-1,1] supposed to be?  Is it +1 or -1, and 
>more importantly WHY? I have a math book here which says it should be -1, 
>but Mathematica gives +1, so which is correct?
>
>So the question is: LegendrePolynomial[n = -1, x = 1] = ??? 
>
>
>  
>

-- 
PGP Key ID: 0x235FDED1
Please avoid sending me Word or PowerPoint attachments.
http://www.gnu.org/philosophy/no-word-attachments.html


  • Prev by Date: Re: Casting a Command as a String
  • Next by Date: Re: Setting gridlines thickness in Plot
  • Previous by thread: LegendreP of order = -1
  • Next by thread: Casting a Command as a String