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http://functions.wolfram.com/06.12.20.0002.01
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D[InverseGammaRegularized[a, z], {a, 2}] ==
E^w w Gamma[a]^3 (E^w (1 - a + w) Gamma[a]
HypergeometricPFQRegularized[{a, a}, {1 + a, 1 + a}, -w]^2 -
2 HypergeometricPFQRegularized[{a, a, a}, {1 + a, 1 + a, 1 + a}, -w]) +
2 E^(2 w) w^(1 - a) (1 - a + w) Gamma[a]^2 HypergeometricPFQRegularized[
{a, a}, {1 + a, 1 + a}, -w] ((-Gamma[a, w]) PolyGamma[a] +
Gamma[a] ((z - 1) Log[w] + PolyGamma[a])) +
E^w w^(1 - 2 a) (E^w (1 - a + w) Gamma[a]^2
((z - 1) Log[w] + PolyGamma[a])^2 + Gamma[a, w]
((-w^a + E^w (1 - a + w) Gamma[a, w]) PolyGamma[a]^2 +
2 a E^w Gamma[a] PolyGamma[a] ((z - 1) Log[w] + PolyGamma[a]) +
w^a (Log[w]^2 - PolyGamma[1, a])) +
Gamma[a] (2 (z - 1) (w^a - E^w (1 + w) Gamma[a, w]) Log[w]
PolyGamma[a] + (w^a - 2 E^w (1 + w) Gamma[a, w]) PolyGamma[a]^2 +
w^a ((1 - 2 z) Log[w]^2 + PolyGamma[1, a]))) /;
w == InverseGammaRegularized[a, z]
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<mo> ( </mo> <mi> a </mi> <mo> ) </mo> </mrow> <mn> 2 </mn> </msup> <mo> ⁢ </mo> <msup> <mrow> <mo> ( </mo> <mrow> <mrow> <mrow> <mo> ( </mo> <mrow> <mi> z </mi> <mo> - </mo> <mn> 1 </mn> </mrow> <mo> ) </mo> </mrow> <mo> ⁢ </mo> <mrow> <mi> log </mi> <mo> ⁡ </mo> <mo> ( </mo> <mi> w </mi> <mo> ) </mo> </mrow> </mrow> <mo> + </mo> <mrow> <semantics> <mi> ψ </mi> <annotation encoding='Mathematica'> TagBox["\[Psi]", PolyGamma] </annotation> </semantics> <mo> ( </mo> <mi> a </mi> <mo> ) </mo> </mrow> </mrow> <mo> ) </mo> </mrow> <mn> 2 </mn> </msup> </mrow> <mo> + </mo> <mrow> <mrow> <mi> Γ </mi> <mo> ⁡ </mo> <mo> ( </mo> <mrow> <mi> a </mi> <mo> , </mo> <mi> w </mi> </mrow> <mo> ) </mo> </mrow> <mo> ⁢ </mo> <mrow> <mo> ( </mo> <mrow> <mrow> <mrow> <mo> ( </mo> <mrow> <mrow> <msup> <mi> log </mi> <mn> 2 </mn> </msup> <mo> ( </mo> <mi> w </mi> <mo> ) </mo> </mrow> <mo> - </mo> <mrow> <msup> <semantics> <mi> ψ </mi> <annotation encoding='Mathematica'> TagBox["\[Psi]", PolyGamma] 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