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math.AG2023
On the component group of the algebraic monodromy group of a surface
Andreas-Stephan Elsenhans, Jörg Jahnel
We provide a lower bound for the number of components of the algebraic monodromy group in the situation of a surface over a number field . In the CM case, our bound is shar…
math.GR2023
Computing Symmetric Normalisers
Andreas-Stephan Elsenhans
The computation of the normaliser of a permutation group in the full symmetric group is an important and hard problem in computational group theory. This article reports on an algo…