Abstract
We construct many examples of level one Siegel modular forms in the kernel of theta operators mod p by using theta series attached to positive definite quadratic forms.
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Böcherer, S., Kodama, H. & Nagaoka, S. On the kernel of the theta operator mod p . manuscripta math. 156, 149–169 (2018). https://doi.org/10.1007/s00229-017-0962-3
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DOI: https://doi.org/10.1007/s00229-017-0962-3