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Maybe it is too late. A lattice has a finite orthogonal group if and only if it is definite or it is on the hyperbolic plane. This can be deduced from Satz (30.4) in Kneser's book Quadratische Formen (taking L = M there).
Maybe it is too late. A lattice has a finite orthogonal group if and only if it is definite or it is the hyperbolic plane. This can be deduced from Satz (30.4) in Kneser's book Quadratische Formen (taking L = M there).
Maybe it is too late. A lattice has a finite orthogonal group if and only if it is definite or it is on the hyperbolic plane. This can be deduced from Satz (30.4) in Kneser's book Quadratische Formen (taking L = M there).
Maybe it is too late. A lattice has a finite orthogonal group if and only if it is definite or it is the hyperbolic plane. This can be deduced from Satz (30.4) in Kneser's book Quadratische Formen (taking L = M there).
