Sullivan, MichaelLowell, Mark2024-04-262024-04-2620172017-0210.7275/9628152.0https://hdl.handle.net/20.500.14394/20155We prove a Seifert-van Kampen theorem for Legendrian submanifolds and exact Lagrangian cobordisms, and use it to calculate the change in the DGA caused by critical Legendrian ambient surgery.Legendrian Contact HomologyGeometry and TopologyA Seifert-van Kampen Theorem for Legendrian Submanifolds and Exact Lagrangian CobordismsDissertation (Open Access)N/A