Semigroups in the universal covering of SL(2).
Semigroup forum, Tome 43 (1991) no. 3, pp. 33-44.

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Mots-clés : simply connected Lie group, differential, one-parameter subgroups, Lorentzian cones, semigroups, cones, semisimple Lie algebras, Lie wedges, tangent wedge
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     author = {K.H. Neeb},
     title = {Semigroups in the universal covering of {SL(2).}},
     journal = {Semigroup forum},
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     publisher = {mathdoc},
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     number = {3},
     year = {1991},
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}
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K.H. Neeb. Semigroups in the universal covering of SL(2).. Semigroup forum, Tome 43 (1991) no. 3, pp. 33-44. http://geodesic.mathdoc.fr/item/SF_1991__43_3_135093/