Abstract
Computations using theta functions with characteristic show that the modular curve X(9) is the complete intersection of two cubics. The holomorphic differentials and Weierstrass gap sequence are also computed.
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Kopeliovich, Y., Quine, J. On the Curve X(9). The Ramanujan Journal 2, 371–378 (1998). https://doi.org/10.1023/A:1009703117263
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DOI: https://doi.org/10.1023/A:1009703117263