Torsion-free groups with indecomposable holonomy group. I
Torsion-free groups with indecomposable holonomy group. I
We study the torsion-free generalized crystallographic groups with indecomposable holonomy group which is isomorphic to either C p s or C p  C p . IntroductionA classical crystallographic group is a discrete cocompact subgroup of I R m , the isometry group of R m .Torsion-free crystallographic groups are …