Nelson, Philip C2023-05-232023-05-231985-03-012017-04-19https://repository.upenn.edu/handle/20.500.14332/43274Talk presented at the Symposium on Anomalies, Topology, and Geometry, Argonne National Laboratory, March, 1985.Physical Sciences and MathematicsPhysicsIntroduction to Sigma Model Anomalies, in Symposium on Anomalies, Geometry, and TopologyPresentation