Top network posts

• 31 Two-sheeted covering of the Klein bottle by the torus
• 18 Examples of group-theoretic results more easily obtained through topology or geometry
• 17 Connected sum of projective plane $\cong$ Klein bottle
• 12 $\mathbb{R}^3 \setminus A$ deformation retracts onto $S^1 \vee S^2$
• 9 How do I see that $\mathbb{CP}^2$ is not the boundary of a compact smooth $5$-manifold?
• 8 Negative binomial distribution - sum of two random variables
• 8 $S^3\times \Bbb CP^\infty$ is not homotopy equivalent to $\left(S^1\times \Bbb CP^\infty\right)\big/\left(S^1\times \{x_0\}\right)$
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