Abstract
Let
Funding statement: The author is a member of INdAM research group for Algebraic and Geometric Structures and their Applications (GNSAGA). He is also a member of the research training group GRK 2240: Algebro-Geometric Methods in Algebra, Arithmetic and Topology, funded by DFG. The author thanks both groups for supporting this project.
Acknowledgements
I want to thank Francesca Dalla Volta for her careful supervision during the preparation of my Ph.D. thesis, from which this work has been extracted.
Communicated by: Andrea Lucchini
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