Die elliptischen Fixpunkte der Hilbertschen Modulgruppen.
Quadratische Semi-Ordnungen und Quadratische Formen.
Existentially closed domains with radical relations.
Decidability of the rings of real algebraic and p-adic algebraic integers.
Realization of finitely generated profinite groups by maximal abelian extensions of fields.
Sums of 2m-th powers of rational functions in one variable over real closed fields.
On places of algebraic function fields.
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