Legendre Polynomial

From: "symbio" <symbio@xxxxxxx>
Date: Sat, 23 Jul 2005 10:18:58 GMT

Can anyone tell me what is the correct mathematical value for
LegendreP[-1,1] supposed to be? is it +1 or -1, and more importatnly WHY?
I have a math book here which says it should be -1, but Mathematica gives
+1. which is correct?

.

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