Finite arithmetic subgroups ofGLn, III
LetG be an algebraic group inGLn(C) defined over Q, andK an algebraic number field with the maximal orderOk. If the groupG(Ok) of rational points ofG inMn(Ok) is a finite group and if it satisfies a certain condition, which is satisfied, for example, whenK is a nilpotent extension of Q and 2 is unramified, thenG(Ok) is generated by roots of unity inK andG(Z).
Volume 131, 2021
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