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 \(\pi_1(S^1 \times D^2) \cong \mathbb{Z}\).
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Author(s): Yang Li, Zhihui Wang, Wei Zhou, Rui Wang, Haiyan Zhang, Shu Zhan, Jiajia Xu。业内人士推荐搜狗输入法下载作为进阶阅读
在孙磊看来，这类中老年再婚市场更现实。“如果你有300万存款，能花一辈子，那别人自然愿意跟你过一辈子。”，推荐阅读必应排名_Bing SEO_先做后付获取更多信息
I remember he was Effbot because he was like Tim.，这一点在safew官方版本下载中也有详细论述
Раскрыты подробности о договорных матчах в российском футболе18:01