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How essential is a spanning surface?

Kindred, Thomas
arXiv (All) · Papers
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57k1057k12geometric-topology
We introduce new numerical invariants of a spanning surface $F\subset S^3$, called the \emph{algebraic essence} and \emph{geometric essence} of $F$, which measure how far $F$ is from being compressible. We extend a theorem of Ozawa by showing that algebraic essence behaves well under Murasugi sum. W
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