Geodesic
Triangular de Rham cohomology of compact Kahler manifolds
Sbornik. Mathematics, Tome 192 (2001) no. 2, pp. 187-214 Cet article a éte moissonné depuis la source Math-Net.Ru

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The de Rham $H^1_{DR}(M,G)$ of a smooth manifold $M$ with values in a group Lie $G$ is studied. By definition, this is the quotient of the set of flat connections in the trivial principal bundle $M\times G$ by the so-called gauge equivalence. The case under consideration is the one when $M$ is a compact Kahler manifold and $G$ is a soluble complex linear algebraic group in a special class containing the Borel subgroups of all complex classical groups and, in particular, the group of all triangular matrices. In this case a description of the set $H^1_{DR}(M,G)$ in terms of the cohomology of $M$ with values in the (Abelian) sheaves of flat sections of certain flat Lie algebra bundles with fibre $\mathfrak g$ (the tangent Lie algebra of $G$) or, equivalently, in terms of the harmonic forms on $M$ representing this cohomology is obtained. 
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     title = {Triangular de {Rham} cohomology of compact {Kahler} manifolds},
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     year = {2001},
     volume = {192},
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     url = {http://geodesic.mathdoc.fr/item/SM_2001_192_2_a1/}
}
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A. Yu. Brudnyi; A. L. Onishchik. Triangular de Rham cohomology of compact Kahler manifolds. Sbornik. Mathematics, Tome 192 (2001) no. 2, pp. 187-214. http://geodesic.mathdoc.fr/item/SM_2001_192_2_a1/

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