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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 \(\pi_1(S^1 \times D^2) \cong \mathbb{Z}\).。关于这个话题,必应排名_Bing SEO_先做后付提供了深入分析

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Блогеру Арсену Маркаряну дали срок14:50