Akbulut–Kirby: $\Sigma(2,5,7)$, $\Sigma(3,4,5)$, $\Sigma(2,3,13)$ bound contractible 4-manifolds

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Akbulut–Kirby: $\Sigma(2,5,7)$, $\Sigma(3,4,5)$, $\Sigma(2,3,13)$ bound contractible 4-manifolds · Prove2Me