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On Lie groups that admit left-invariant Lorentz metrics of constant sectional curvature
IntroductionWe say that a non-abelian Lie group G is of special type if its Lie algebra, g, has the property that [x, y] is a linear combination of x and y for all x, y in g.In [3], J. Milnor proved that every left-invariant Riemannian metric on a Lie group …