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Re: LegendreP error (bug?) in Mathematica


To symbio:

Differential equation for LegendreP has the symmetry n->(-n-1).
This symmetry is used to define what we mean by LegendreP[n,x]
for negative n. The formula is quoted in my previous email.

In the previous post I must have added that the sum does not define
LegendreP for negative n.

Per your suggestion I am quoting you the result from a math book,
which says:

  LegendreP[n, 1] == 1 for non-negative integer n
  LegendreP[n,1] == LegendreP[ -n-1, 1] == 1 for nagative integer n.

Please feel free to quote the text-book you refer to, to be more
precise.
I am using

N.N. Lebedev, "Special Functions and Their applications"

Oleksandr Pavlyk
Wolfram Research


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