Appendix D: Some identities for the Dirichlet kernel in a slab configuration

We refer to the framework of Section 2.10 about the slab configuration where $\text{Ω}={\text{Ω}}_1\times {\text{R}}^{d_2};$ in the present appendix we retain all the assumptions and notations of the cited section and show how to derive Eqs. (2.131)–(2.133)…