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Torus
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== Two-sheeted cover == The 2-torus is a twofold branched cover of the 2-sphere, with four [[ramification point]]s. Every [[conformal structure]] on the 2-torus can be represented as such a two-sheeted cover of the 2-sphere. The points on the torus corresponding to the ramification points are the [[Weierstrass point]]s. In fact, the conformal type of the torus is determined by the [[cross-ratio]] of the four points.
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