EUDML | Least-volume representatives of homology classes in $G(2,\mathbf {C}^4)$

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Displaying similar documents to “Least-volume representatives of homology classes in $G (2, 𝐂^{4})$ ”

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The additive group actions on $ℚ$ -homology planes

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In this article, we prove that a $ℚ$ -homology plane $X$ with two algebraically independent $G_{a}$ -actions is isomorphic to either the affine plane or a quotient of an affine hypersurface $x y = z^{m} - 1$ in the affine $3$ -space via a free $ℤ / m ℤ$ -action, where $m$ is the order of a finite group $H_{1} (X; ℤ)$ .