Geodesic
Projective representations of finite groups over number rings
Sbornik. Mathematics, Tome 11 (1970) no. 3, pp. 391-410 Cet article a éte moissonné depuis la source Math-Net.Ru

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We solve the problem of finding the number $n(R,G)$ of nondecomposable projective representations of a finite group $G$ over the ring $R$ of all integers of a finite extension $F$ of the field of rational $p$-adic numbers $Q$. Also we clear up the question as to when all indecomposable projective $R$-representations of a group $G$ are realized by left ideals of crossed group rings of the group $G$ and the ring $R$. We note that for ordinary $R$-representations of a group $G$ the problem of the finiteness of the number $n(R,G)$ was investigated by S. D. Berman, I. Reiner, A. Heller, H. Yacobinski and one of the authors of the present article. Bibliography: 30 titles. 
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     title = {Projective representations of finite groups over number rings},
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     url = {http://geodesic.mathdoc.fr/item/SM_1970_11_3_a6/}
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L. F. Barannik; P. M. Gudivok. Projective representations of finite groups over number rings. Sbornik. Mathematics, Tome 11 (1970) no. 3, pp. 391-410. http://geodesic.mathdoc.fr/item/SM_1970_11_3_a6/

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