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Autor:
Aloys Krieg, Felix Schaps
Publikováno v:
Proceedings of the American Mathematical Society.
We characterize the maximal discrete subgroups ofSO+(2,n+2)SO^+(2,n+2), which contain the discriminant kernel of an even lattice with two hyperbolic planes overZ\mathbb {Z}. They coincide with the normalizers inSO+(2,n+2)SO^+(2,n+2)and are given by t