Automorphisms and reduction of Heegner points on Shimura curves at Cerednik-Drinfeld primes
Automorphisms and reduction of Heegner points on Shimura curves at Cerednik-Drinfeld primes
Let $X$ be a Shimura curve of genus at least 2. Exploiting Äerednik-Drinfeldâs description of the special fiber of $X$ and the specialization of its Heegner points, we show that under certain technical conditions, the group of automorphisms of $X$ corresponds to its group of Atkin-Lehner involutions.