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Integral leading to Hypergeometric1F1
*To*: mathgroup at yoda.physics.unc.edu
*Subject*: Integral leading to Hypergeometric1F1
*From*: Steven M. Christensen <stevec at yoda.physics.unc.edu>
*Date*: Sun, 1 Aug 93 00:16:28 -0400
I'm using MMA 2.2 on a decstation to solve the integral below.
<<Declare.m
Declare[n, Integer]
Declare[n, NonNegative]
Declare[V, Positive]
Declare[A, NonNegative]
Integrate[v^(2 n + 3) Exp[-v^2/V^2] / Sqrt[v^2 - A^2], {v,A,Infinity}]
2
3 + 2 n 3 1 1 A
V Gamma[- + n] Hypergeometric1F1[-, -(-) - n, -(--)]
2 2 2 2
V
Out[15]= ----------------------------------------------------------- +
2
2
3 + 2 n 3 5 A
A Sqrt[Pi] Gamma[-(-) - n] Hypergeometric1F1[2 + n, - + n, -(--)]
2 2 2
V
> ------------------------------------------------------------------------
2 Gamma[-1 - n]
Given the fact that n=0,1,2,.., and that A >= 0 and that V > 0
(both A and V are finite real constants), can't I assume that
the second term in the answer above is always zero (since the
denominator goes to infinity) ? The use of some typical values
indicate that the second term indeed vanishes. Thus, is there a
way I can convince MMA to drop the second term (assuming it indeed
vanishes) ?
Recall that Hypergeometric1F1[2 + n, 5/2 + n, x] is entire function of x.
I also tried the integral above with Maple V.2 but it couldn't solve the
integral at all (or any of its variations). I did use the assume
facility do declare the types of n, A and V. Perhaps I need to load
some obscure macro library (which I'm not aware of).
Thanks.
Roque
oliveria at engin.umich.edu
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