Computing weight one modular forms over C and Fpbar
classification
🧮 math.NT
keywords
characteristicweightzerocomputationcomputingcuspcuspidaleigenforms
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We report on a systematic computation of weight one cuspidal eigenforms for the group $\Gamma_1(N)$ in characteristic zero and in characteristic $p>2$. Perhaps the most surprising result was the existence of a mod 199 weight~1 cusp form of level 82 which does not lift to characteristic zero.
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