Abstract
Let K/k be a finite Galois extension of an infinite field k with group G. Let χ be an faithful (m + 1)-dimensional projective representation of G, and let Br(K/k) be the Brauer group of the extension K/k. It is proved that there exist points ξ=ξ=(ξ1;...;ξm;ξm+1=1) in Pm(K) such that ξσ=ξϰ(σ), ∀σ, ∈ G and K=k(ξ1,...,ξm, if and only if the associated class of cohomologies ηϰ vanishes under the homomorphism H2(G,K*)m+1 → Br(K/k)m+1. We denote by ξσ the coordinatewise action of G, and by ξϰ(σ) the geometric action determined by the representation ϰ. A construction is given for the elements ξ. As a corollary the author obtains a description of the solutions of a large class of inverse problems in Galois theory with certain constraints on ϰ and K/k.
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Literature cited
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Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova Akademii Nauk SSSR, Vol. 175, pp. 128–134, 1989.
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Tsvetkov, V.M. The Klein resolvent. J Math Sci 57, 3520–3523 (1991). https://doi.org/10.1007/BF01100124
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DOI: https://doi.org/10.1007/BF01100124