BIRS Workshop Lecture Videos

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BIRS Workshop Lecture Videos

Semigroups of iterated torus knots and the Upsilon invariant Wang, Shida


We will introduce the semigroup of L-space iterated torus knots. Then we will discuss the usage of semigroups and some subtleties in the computation of the Upsilon invariant for torus knots. Finally we will give some observations on the kernel of the Upsilon invariant.

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