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}t d|dz |dz dz � � }t t j |dz |� � |z t j ||� � dd�� � dS dS ) z�Test relation of wright_bessel and modified bessel function iv.
iv(z) = (1/2*z)**v * Phi(1, v+1; 1/4*z**2).
See https://dlmf.nist.gov/10.46.E2
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� � t t | |dz
|� � | |z t | || z |� � z |dz
t | ||� � z z dd�� � dS )a= Test functional relation of wright_bessel.
Phi(a, b-1, z) = a*z*Phi(a, b+a, z) + (b-1)*Phi(a, b, z)
Note that d/dx Phi(a, b, x) = Phi(a, b-1, x)
See Eq. (22) of
B. Stankovic, On the Function of E. M. Wright,
Publ. de l' Institut Mathematique, Beograd,
Nouvelle S`er. 10 (1970), 113-124.
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Here we test for reduced accuracy or even nan.
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