Explore an advanced lecture on Coulomb branches of 3D N=4 supersymmetric gauge theories and their connection to bow varieties in this two-hour presentation by Hiraku Nakajima from KAVLI IPMU, Japan. Delve into the intricate mathematical structures underlying these physical theories, examining how bow varieties provide insights into the geometry of Coulomb branches. Gain a deeper understanding of the interplay between supersymmetric gauge theories and algebraic geometry, building upon previous knowledge in the field.