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The 2-cohomology of the group $\Omega^-(4,q)$ with coefficients in the natural module
Sbornik. Mathematics, Tome 198 (2007) no. 9, pp. 1247-1260 Cet article a éte moissonné depuis la source Math-Net.Ru

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The 2-cohomology group is determined for the finite simple orthogonal group $\Omega^-(4,q)$, where $q$ is odd, with coefficients in the natural module. For $q\ne9$ this group is trivial, and for $q=9$ it is isomorphic to $Z_3^4$. Thus Küsefoglu's result is corrected. Bibliography: 5 titles. 
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V. P. Burichenko. The 2-cohomology of the group $\Omega^-(4,q)$ with coefficients in the natural module. Sbornik. Mathematics, Tome 198 (2007) no. 9, pp. 1247-1260. http://geodesic.mathdoc.fr/item/SM_2007_198_9_a1/

[1] A. S. Küsefoglu, “The second degree cohomology of finite orthogonal groups, I”, J. Algebra, 56:1 (1979), 207–220 | DOI | MR | Zbl

[2] A. S. Küsefoglu, “The second degree cohomology of finite orthogonal groups, II”, J. Algebra, 67:1 (1980), 88–109 | DOI | MR | Zbl

[3] Zh. Dedonne, Geometriya klassicheskikh grupp, Mir, M., 1974 ; J. A. Dieudonné, La géométrie des groupes classiques, Springer-Verlag, Berlin–Heidelberg–New York, 1971 | MR | Zbl | MR | Zbl

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