On 20 September 2022 I gave a zoom talk at the Yau Mathematical Sciences Center at Tsinghua University in Beijing. The talk was in the YMSC Topology Seminar.

Title: A symplectic approach to 3-manifold triangulations and hyperbolic structures

**Abstract: **In the 1980s, Neumann and Zagier introduced a symplectic vector space associated to an ideal triangulation of a cusped 3-manifold, such as a knot complement. We give an interpretation for this symplectic structure in terms of the topology of the 3-manifold, via intersections of certain curves on a Heegaard surface. We also give an algorithm to construct curves forming a symplectic basis for this vector space. This approach gives a description of hyperbolic structures on a knot complement via Ptolemy equations, which can be used to calculate the A-polynomial. This talk involves joint work with Jessica Purcell and Joshua Howie.

**Video: **The talk was recorded and a video of the talk is available through the YMSC website here.

**Slides: **from the talk are below.