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Indecomposable projective representations of direct products of finite groups over a ring of formal power series

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Abstrakty
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Let F be a field of characteristic p > O, S = F[[X]] the ring of formal power series in the indeterminate X with coefficients in the field F, F* the multiplicative group of F, G = Gp x B a finite group, where Gp is a p-group and B is a p'-group. We give necessary and sufficient conditions for G and F under which there exists a cocycle λ ∈ Z2 (G, F*) such that every indecomposable projective 5-representation of G with the cocycle λ is the outer tensor product of an indecomposable projective 5-representation of Gp and an irreducible projective 5-representation of B.
Twórcy
  • Institute of Mathematics. Pomeranian University of Słupsk. Arciszewskiego 22b, 76-200 Słupsk, Poland
Bibliografia
  • [1] L.F. Barannyk. On the question of faithful projective representations of finite Abelian groups over arbitrary field. Ukrain. Math. J., 26, No. 6, 784-790, 1974.
  • [2] L.F. Barannyk. Modular projective representations of direct products of finite groups. Publ. Math. Debrecen, 63 (4), 537-554, 2003.
  • [3] L.F. Barannyk. On faithful irreducible projective representations of finite groups over a field of characteristic p. J. Algebra, 321, 194-204, 2009.
  • [4] L.F. Barannyk, D. Klein. Twisted group rings of strongly unbounded representation type. Colloq. Math., 100 (2), 265-287, 2004.
  • [5] H. Bass. Torsion free and projective modules. Trans. Amer. Math. Soc., 102 (2), 319-327, 1962.
  • [6] H.I. Blau. Indecomposable modules for direct products of finite groups. Pacific J. Math., 54 (1), 39-44, 1974.
  • [7] C.W. Curtis, I. Reiner. Representation Theory of Finite Groups and Associative Algebras. Interscience, New York, 1962.
  • [8] C.W. Curtis, I. Reiner. Methods of Representation Theory with Applications to Finite Groups and Orders,Vol. 1. Willey, New York, 1981.
  • [9] J.A. Green. On the indecomposable representations of a finite group. Math. Z., 70, 430-445, 1959.
  • [10] P.M. Gudyvok. On modular and integral representations of finite groups. Dokl. Akad. Nauk SSSR, 214, No. 5, 993-996, 1974. (In Russian).
  • [11] P.M. Gudyvok. On modular and integral P-adic representations of direct product of groups. Ukrain. Math. J., 29, No. 5, 580-588, 1977. (In Russian).
  • [12] P.M. Gudyvok. On representations of direct product of groups over complete discrete valuation rings. Dokl. Akad. Nauk SSSR, 237, No. 1, 25-27, 1977. (In Russian).
  • [13] P.M. Gudyvok. On representations of a direct product of finite groups over complete discrete valuation rings. Ukrain. Math. Bull., 2, No. 1, 67-75, 2005.
  • [14] G. Karpilovsky. Group Representations, Vol. 1. North-Holland Mathematics Studies 175, North-Holland, Amsterdam, 1992.
  • [15] G. Karpilovsky. Group Representations, Vol. 2. North-Holland Mathematics Studies 177, North-Holland, Amsterdam, 1993.
  • [16] H.N. Ng. Degrees of irreducible representations of finite groups. J. London Math. Soc., (2)10, 379-384, 1975.
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