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LegendreP of order = -1
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] = ???