$H_k(\Sigma^4\setminus\{p\};\mathbb Z)=0$ for $k\ge1$: a punctured homotopy four-sphere is acyclic

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$H_k(\Sigma^4\setminus\{p\};\mathbb Z)=0$ for $k\ge1$: a punctured homotopy four-sphere is acyclic · Prove2Me