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Feb 4, 2023 at 7:03 comment added The Amplitwist The link to springerlink.com is broken. I'm also unable to find any copy saved on the Wayback Machine.
Sep 23, 2021 at 3:19 comment added David Roberts Martin Sleziak found what it looks like that last link should be, namely "Knots, Links, and 4-Manifolds", by Ronald Fintushel, Ronald J. Stern (arxiv.org/abs/dg-ga/9612014) and I have replaced it. Please update if this is not correct
Sep 23, 2021 at 3:18 history edited David Roberts CC BY-SA 4.0
fixed last remaining arxiv front-end link
Sep 23, 2021 at 1:34 history edited David Roberts CC BY-SA 4.0
fixed arxiv front-end links, except one.
Dec 22, 2011 at 10:54 vote accept Nikita Kalinin
Dec 22, 2011 at 10:54 history bounty ended Nikita Kalinin
Dec 13, 2011 at 12:13 comment added Marco Golla In the first part, one can also apply Li's theorem to a Fermat hypersurface $X$ (the zero set of polynomials $\sum x_i^d$ in $\mathbb{CP}^3$) of degree $d>4$: $X$ is homeomorphic to a connected sum of $\mathbb{CP}^2$s and $\overline{\mathbb{CP}}^2$s, has $b_2^+>2$, and can't be homeomorphic to a blow-up of $\mathbb{CP}^2$ (because of $b_2^+$) or any $S^2$-bundle over a surface (because of fundamental group the base has to be $S^2$, and $b_2^+$ rules this out again).
Dec 13, 2011 at 4:26 history answered Mike Usher CC BY-SA 3.0