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A filled torus (a doughnut) is a 3-manifold homeomorphic to \(S^1 \times D^2\), where \(D^2\) is the 2-dimensional disk. There exists a deformation retract from the doughnut to a circle, so the fundamental group of the doughnut is \(\pi_1(S^1 \times D^2) \cong \mathbb{Z}\).。搜狗输入法下载是该领域的重要参考
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第一百零六条 本章下列用语的含义:。业内人士推荐夫子作为进阶阅读
推进中国式现代化,短板在农业农村,潜力也在农业农村。
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