Hypergeometric1F1Regularized[a, 2 a + 1, z] == ((E^(z/2) Sqrt[Pi])/(2 Gamma[1 + a])) z^(1/2 - a) (BesselI[-(1/2) + a, z/2] - BesselI[1/2 + a, z/2])

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2001-10-29