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 
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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},
     publisher = {mathdoc},
     volume = {67},
     number = {3},
     year = {1992},
     zbl = {0816.20037},
     url = {http://geodesic.mathdoc.fr/item/CMH_1992__67_3_140267/}
}
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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/