Abstract
We prove some new structure results for automorphic products of singular weight. First, we give a simple characterisation of the Borcherds function$\unicode[STIX]{x1D6F7}_{12}$. Second, we show that holomorphic automorphic products of singular weight on lattices of prime level exist only in small signatures and we derive an explicit bound. Finally, we give a complete classification of reflective automorphic products of singular weight on lattices of prime level.
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