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math.AG2004
Group Actions, Cyclic Coverings and Families of K3-Surfaces
Alessandra Sarti
In this paper we describe six pencils of K3-surfaces which have large Picard-Number and contain precisely five singular fibers: four have A-D-E singularities and one is non-reduced…
math.AG2004
A geometrical construction for the polynomial invariants of some reflection groups
Alessandra Sarti
In these notes we investigate the rings of real polynomials in four variables, which are invariant under the action of the reflectiongroups [3,4,3] and [3,3,5]. It is well known th…