$\operatorname{D}_{1}\left(\nu,\mu,z\right)={\operatorname{M}^{(3)}_{\nu}}'%
\left(z\right){\operatorname{M}^{(4)}_{\mu}}\left(z\right)-{\operatorname{M}^{%
(4)}_{\nu}}'\left(z\right){\operatorname{M}^{(3)}_{\mu}}\left(z\right),$