2 problems

Let $\tau$ be as in the surrounding discussion, and let $\theta_{\Delta(\tau,\ell)}\in\Theta_{\Delta(\tau,\ell)}$ and…

Let $1 \leq \ell<n$. Let $\theta_{\Delta(\tau,\ell)}$ and $\theta_{\Delta(\tau,2n+\ell)}$ be given theta functions, and let $f'_{\Delta(\tau,2n),s}$ be a section of the relevant ind…