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math.NT2005
CM newforms with rational coefficients
Matthias Schuett
We classify newforms with rational Fourier coefficients and complex multiplication for fixed weight up to twisting. Under the extended Riemann hypothesis for odd real Dirichlet cha…
math.AG2005
The maximal singular fibres of elliptic K3 surfaces
Matthias Schuett
We prove that the maximal singular fibres of elliptic K3 surfaces have type I_19 and I_14* unless the characteristic of the ground field is 2. In characteristic 2, the maximal sing…