On the Algebraic Cohomology of Real Algebraic $M$-Varieties
Matematičeskie zametki, Tome 76 (2004) no. 6, pp. 854-867.

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For a real algebraic $M$-variety $X$, the canonical homomorphism of the algebraic cohomology group of the set of real points into the algebraic cohomology group of the set of complex points $$ \varrho_k\colon H_{\operatorname{alg}}^k(X(\mathbb R),\mathbb Z/2)\to H_{\operatorname{alg}}^{2k}(X(\mathbb C),\mathbb Z/2). $$ is considered. This homomorphism agrees with the cycle mappings. Estimates for the dimension of the kernel of this homomorphism are given.
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V. A. Krasnov. On the Algebraic Cohomology of Real Algebraic $M$-Varieties. Matematičeskie zametki, Tome 76 (2004) no. 6, pp. 854-867. http://geodesic.mathdoc.fr/item/MZM_2004_76_6_a5/

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