test (Q16): Difference between revisions

${\displaystyle {\begin{aligned}{\frac {\mathrm {d} }{\mathrm {d} z}}\psi _{\mathbf {g} }(z)&=2\mathrm {i} \pi s_{\mathbf {g} }\psi _{\mathbf {g} }(z)+{\frac {\mathrm {i} \pi }{\rho _{\mathbf {g} }}}\sum _{\mathbf {h} \in \Lambda _{m}^{*}}U_{\mathbf {g-h} }\psi _{\mathbf {h} }(z)\\\quad s_{g}&=-{\frac {g\cdot (2k_{0}+g)}{2n\cdot (k_{0}+g)}}\end{aligned}}}$