D[Erf[Subscript[z, 1], Subscript[z, 2]], {Subscript[z, 2], n}] == 2^n Subscript[z, 2]^(1 - n) HypergeometricPFQRegularized[{1/2, 1}, {1 - n/2, (3 - n)/2}, -Subscript[z, 2]^3] /; Element[n, Integers] && n >= 0

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2001-10-29