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[[Stereographic projection]] of the Hopf fibration induces a remarkable structure on '''R'''<sup>3</sup>, in which space is filled with nested [[torus|tori]] made of linking [[Villarceau circles]]. Here each fiber projects to a [[circle]] in space (one of which is a line, thought of as a "circle through infinity"). Each torus is the stereographic projection of the [[inverse image]] of a circle of latitude of the 2-sphere. (Topologically, a torus is the product of two circles.) These tori are illustrated in the images at right. When '''R'''<sup>3</sup> is compressed to a ball, some geometric structure is lost although the topological structure is retained (see [[Geometry#Topology_and_geometry|Topology and Geometry]]). The loops are [[homeomorphic]] to circles, although they are not geometric [[circle]]s.
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Existen numerosas generalizaciones de la fibración de Hopf. La esfera unidad en '''C'''<sup>''n''+1</sup> se fibra naturalmente en '''CP'''<sup>''n''</sup> with circles as fibers, existen también versiones de estas fibraciones [[número real|reales]], [[
:<math>S^0\hookrightarrow S^1 \rightarrow S^1, \,\!</math>
:<math>S^1\hookrightarrow S^3 \rightarrow S^2, \,\!</math>
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