 Conjugate global relations for the modified Helmholtz equation

The two modified Helmholtz adjoint plane waves $v_{\lambda }$ and ${\tilde{v}}_{\lambda }=\overline{v_{\overline{\lambda }}}$ give boundary identities $\mathcal{G}(\lambda )=0$ and $\tilde{\mathcal{G}}(\lambda )=0$. For real solution traces, $\tilde{\mathcal{G}}(\lambda )=\overline{\mathcal{G}(\overline{\lambda })}$. Reality is needed for this conjugation argument; the parametrization separately yields the reciprocal identity $\tilde{\mathcal{G}}(\lambda )=\mathcal{G}(1/\lambda )$.