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<p>surfaces. Geometrically, these correspond to surfaces with negative, vanishing or positive constant <a href="page.php?w=sectional_curvature">sectional curvature</a>. That is, every connected Riemann surface  admits a unique <a href="page.php?w=completeness_%28topology%29">complete</a> 2-dimensional real <a href="page.php?w=Riemannian_manifold">Riemann metric</a> with constant curvature equal to ,  or  that belongs to the conformal class of Riemannian metrics determined by its structure as a Riemann surface. This can be seen as a consequence of</p><p>
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