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Sep 21, 2022 at 11:22 vote accept kslhg
Sep 21, 2022 at 8:05 comment added kslhg Wow! It’s great! Thanks a lot!!
Sep 21, 2022 at 7:21 comment added David Loeffler I've edited the answer to include a function which allows you to input any combination of levels and weights.
Sep 21, 2022 at 7:19 history edited David Loeffler CC BY-SA 4.0
fixed code for higher weight
Sep 21, 2022 at 6:14 vote accept kslhg
Sep 21, 2022 at 6:15
Sep 21, 2022 at 6:14 comment added kslhg Oh thank you! I fixed it.
Sep 21, 2022 at 5:49 comment added David Loeffler I'm guessing you didn't compensate for the normalisation which makes $W_Q^2$ a nontrivial power of Q when the weight is $>2$.
Sep 21, 2022 at 3:03 comment added kslhg For the first code, in case Gamma0(21), wt=12, I got (x + 4084101)^13 * (x - 4084101)^15, as I expected. (we know that $\dim S_{k}(\Gamma_{0}(21))=28$ and $\dim S_{k}(\Gamma_{0}^{+}(21))=13$.) However, for the second code, I got [1, 1] 0, [1, -1] 0, [-1, 1] 0, [-1, -1] 0. I expect [1, 1] 8, since $\dim S_{k}(\Gamma_{0}^{*}(21))=8$. Here $\Gamma_{0}^{+}(21)=<\Gamma_{0}(21) , W_{21}>$ and $\Gamma_{0}^{*}(21)$ is the group generated by $\Gamma_{0}(21)$ and all A-L involution. What's the problem? Is it because I didn't understand the modular symbol deeply and just followed the code you gave me..?
Sep 20, 2022 at 9:57 history answered David Loeffler CC BY-SA 4.0