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Modularity of certain theta series associated to hyperbolic lattice

For the purpose of someone seeing this question, I'll describe what I've figured out so far, which I think elaborates on Paul's comment. Though a warning: This isn't my forte so there may be errors. A …
Philip Engel's user avatar
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Modularity of certain theta series associated to hyperbolic lattice

Let $L$ be an even hyperbolic lattice, i.e. a free $\mathbb{Z}$-module with a non-degenerate inner product $\cdot$ valued in $\mathbb{Z}$ of signature $(1,n)$ such that the norm of every vector is eve …
Philip Engel's user avatar
  • 1,493