Geodesic
Semigroups in the simply connected covering of SL(2).
Semigroup forum, Tome 46 (1993) no. 1, pp. 379-387

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Zbl
Mots-clés : reachable sets, controllability, left-invariant Lorentzian metric, geodesics, simply connected covering group, , Lie semigroups, one-parameter semigroups, Lie algebra, Lorentzian cones, adjoint action, Pontrjagin Maximum Principle, smooth causal loops, exponential function 
D. Mittenhuber. Semigroups in the simply connected  covering of SL(2).. Semigroup forum, Tome 46 (1993) no. 1, pp. 379-387. http://geodesic.mathdoc.fr/item/SF_1993__46_1_135244/
@article{SF_1993__46_1_135244,
     author = {D. Mittenhuber},
     title = {Semigroups in the simply connected  covering of {SL(2).}},
     journal = {Semigroup forum},
     pages = {379--387},
     year = {1993},
     volume = {46},
     number = {1},
     zbl = {0776.22001},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135244/}
}
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