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Aug 19, 2019 at 17:58 comment added Will Sawin @JaredWeinstein I think so, I just misread “allowed to consist of one closed point of degree 4” and thought they only handled that case.
Aug 19, 2019 at 17:28 comment added Jared Weinstein Thanks so much for this answer, and for the clear explanation using vector bundles, especially the explanation of the constant term map. In the Deligne-Flicker paper you cite, Prop. 7.1 seems to be saying that for $\mathrm{deg} D = 4$, the number of cusp forms is $q$ on the nose, is that correct?
Aug 19, 2019 at 17:28 vote accept Jared Weinstein
Aug 16, 2019 at 21:17 history edited Will Sawin CC BY-SA 4.0
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Aug 16, 2019 at 21:11 history edited Will Sawin CC BY-SA 4.0
added 340 characters in body
Aug 16, 2019 at 21:05 history answered Will Sawin CC BY-SA 4.0