Unexpected Primes of Good Reduction in Quotients of Modular and Shimura Curves
ABSTRACT We find all zero‐dimensional spaces of newforms of weight 2 and squarefree level with a fixed Atkin–Lehner sign pattern. As an application, we classify unexpected primes of good reduction of Atkin–Lehner quotients of modular and Shimura curves of squarefree levels.
Authors
- John Voight (ORCID: https://orcid.org/0000-0001-7494-8732)
- Oana Padurariu (ORCID: https://orcid.org/0000-0003-2616-4639)
- Sun Woo Park (ORCID: https://orcid.org/0000-0001-5049-1694)
Institutions
- The University of Sydney (AU)
- Max Planck Institute for Mathematics (DE)
Publication Details
- Journal
- Mathematische Nachrichten
- Published
- 2026-10-30
- DOI
- https://doi.org/10.1002/mana.70292
- Primary Topic
- Advanced Algebra and Geometry
- Type
- article
- Field-Weighted Citation Impact
- 0.00