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math.AT2023
Complex Vasquez invariant
Anna Gąsior, Rafał Lutowski
In 1970 Vasquez proved that to every finite group we can assign a natural number with the property that every flat manifold with holonomy is a total space of a fiber…
math.GR2023
Minimal non-solvable Bieberbach groups
Rafał Lutowski, Andrzej Szczepański
It has been shown by several authors that there exists a non-solvable Bieberbach group of dimension . In this note we show that this is in fact a minimal dimension for such kin…