We study the connected component of the special fiber of the Neron model of a torus split over a tamely ramified extension. It turns out to be a product of Witt vectors of finite length, explicitly calculable. We are thus able to correct a result presented in Kunyavskii and Sansuc (C. R. Acad. Sci. Paris, Ser. 1324 (1997) 307-312). (C) 2003 Academie des sciences. Publie par Elsevier SAS. Tous droits reserves.
机构:
US Navy, Postgrad Sch, Inst Appl Math, Monterey, CA 93943 USA
Romanian Acad, Inst Math Simion Sloilow, Bucharest, RomaniaUS Navy, Postgrad Sch, Inst Appl Math, Monterey, CA 93943 USA