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On a case of extensions of group schemes. (English) Zbl 0412.14022

14L15 Group schemes
14A15 Schemes and morphisms
14D15 Formal methods and deformations in algebraic geometry
20G35 Linear algebraic groups over adèles and other rings and schemes
20G15 Linear algebraic groups over arbitrary fields
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[1] Séminaire de Géométrie Algébrique 1962/1964 dirigé par M. Demazure et A. Grothendieck, Schémas en groupes. II, Lecture Notes in Math., vol. 152, Springer-Verlag, Berlin, 1970.
[2] Michel Demazure and Pierre Gabriel, Groupes algébriques. Tome I: Géométrie algébrique, généralités, groupes commutatifs, Masson & Cie, Éditeur, Paris; North-Holland Publishing Co., Amsterdam, 1970 (French). Avec un appendice Corps de classes local par Michiel Hazewinkel. · Zbl 0203.23401
[3] Michel Raynaud, Faisceaux amples sur les schémas en groupes et les espaces homogènes, Lecture Notes in Mathematics, Vol. 119, Springer-Verlag, Berlin-New York, 1970 (French). · Zbl 0195.22701
[4] B. Ju. Veĭsfeĭler and I. V. Dolgačev, Unipotent group schemes over integral rings, Izv. Akad. Nauk SSSR Ser. Mat. 38 (1974), 757 – 799 (Russian). · Zbl 0314.14015
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