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Homotopy theory, homological algebra, algebraic treatments of manifolds.
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Is there a simple formula to compute the Casson invariant of an homology $3$-sphere from its...
Let $(S_g,\boldsymbol{\alpha}_1,\boldsymbol{\alpha}_2)$ be a Heegaard diagram of a Heegaard splitting $\Sigma=H_g \cup_{\phi_1\phi_2^{-1}}H_g$ of an integral homology sphere $\Sigma$, i.e. $S_g$ is a …