The automorphism group of the non-split Cartan modular curve of level 11
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We derive equations for the modular curve X-ns(11) associated to a non-split Cartan subgroup of GL(2)(F-11). This allows us to compute the automorphism group of the curve and show that it is isomorphic to Klein's four group. (C) 2014 Elsevier Inc. All rights reserved.
CitationDose, V. [et al.]. The automorphism group of the non-split Cartan modular curve of level 11. "Journal of algebra", 01 Novembre 2014, vol. 417, p. 95-102.