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Automorphisms

CanonicalInvolution(X) : CrvMod -> MapSch
AtkinLehnerInvolution(X,N) : CrvMod, RngIntElt -> MapSch
Given a projective modular curve X = X0(N), the function returns the Atkin-Lehner involution of the modular curve as a map of schemes. Currently, the only Atkin-Lehner involution returned is that for N equal to the level of X.
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Version: V2.19 of Mon Dec 17 14:40:36 EST 2012