If $L=\mathbb{Z}\omega_1+\mathbb{Z}\omega_2$ is a lattice , why can a weakly modular function $F$ be associated with a function $f(\tau)$defined on the upper half-plane by the formula $f(\tau)=F(\mathbb{Z}\tau+\mathbb{Z}) .$
2026-03-28 07:53:20.1774684400
modular forms on lattices
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