Geodesic
Rational tori, semisimple orbits and the topology of hyperplane complements.
Commentarii mathematici Helvetici, Tome 67 (1992) no. 3, pp. 226-251

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Mots-clés : unipotent elements, nilpotent elements, connected reductive groups, Frobenius endomorphism, number of regular semisimple classes, maximal tori, alternating character, Weyl groups, hyperplane complements, cohomology modules 
G.I. Lehrer. Rational tori, semisimple orbits and the topology of hyperplane complements.. Commentarii mathematici Helvetici, Tome 67 (1992) no. 3, pp. 226-251. http://geodesic.mathdoc.fr/item/CMH_1992__67_3_140267/
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     author = {G.I. Lehrer},
     title = {Rational tori, semisimple orbits and the topology of hyperplane complements.},
     journal = {Commentarii mathematici Helvetici},
     pages = {226--251},
     year = {1992},
     volume = {67},
     number = {3},
     zbl = {0816.20037},
     url = {http://geodesic.mathdoc.fr/item/CMH_1992__67_3_140267/}
}
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