Abstract

We give a method for constructing vector-valued modular forms from singular scalar-valued ones of a suitable type. As an application, we prove that two remarkable spaces of vector-valued modular forms, which seem to be unrelated at a first look since they are constructed in two very different ways, are the same. More precisely, let $$V_{grad}$$ be the vector space generated by vector-valued modular forms constructed with gradients of odd theta functions and let $$V_\Theta $$ be the one generated by vector-valued modular forms arising from second order theta constants with our construction. We will prove that $$V_{grad}=V_\Theta $$ .

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