Involutory elliptic curves over
For let be a subgroup of the Atkin-Lehner involutions of the Drinfeld modular curve . We determine all and for which the quotient curve is rational or elliptic.
On elliptic curves in characteristic 2 with wild additive reduction
Modular automorphisms of the Drinfeld modular curves X (n).
On singular and supersingular invariants of Drinfeld modules
On the uniqueness of elliptic K3 surfaces with maximal singular fibre
We explicitly determine the elliptic surfaces with section and maximal singular fibre. If the characteristic of the ground field is different from , for each of the two possible maximal fibre types, and , the surface is unique. In characteristic the maximal fibre types are and , and there exist two (resp. one) one-parameter families of such surfaces.
On the torsion of elliptic curves over cubic number fields
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