(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

[tex]

\mathop {\lim }\limits_{x - > 1} \ln (1 - x)(P_{l - 1} (x) - xP_l (x)) - \mathop {\lim }\limits_{x - > - 1} \ln (1 + x)(P_{l - 1} (x) - xP_l (x))[/tex]

where [tex]P_{l}[/tex] are the Legendre Polynomials.

2. Relevant equations

Legendre polynomial recursion relations I suppose

3. The attempt at a solution

So in trying to determine this limit. L'Hospitals rule doesn't come up with anything useful seemingly. However, would it be mathematically legal to switch the limit of the right side to x-> 1 and switch out every x for -x? I can't seem to figure out this limit. If this were legal, I think I could determine this limit for l = 0 using this idea but for an arbitrary l I don't think this would work. Anyone got any tips? :)

**Physics Forums - The Fusion of Science and Community**

# Limit change of variable legality?

Have something to add?

- Similar discussions for: Limit change of variable legality?

Loading...

**Physics Forums - The Fusion of Science and Community**