La, HoSeongNelson, Philip C2023-05-232023-05-231989-03-012017-04-19https://repository.upenn.edu/handle/20.500.14332/43280We show how to treat boundary divergences in heterotic string theory covariantly and unambiguously. The method applies even to theories with nonvanishing tadpoles; in this case the Fischler-Susskind mechanismsuffices to ensure unambiguous amplitudes. No splitting or projection of supermoduli space is needed.Electronic version of an article published as [Superstring '89, 1989, 35-48] [© [copyright World Scientific Publishing Company]Physical Sciences and MathematicsPhysicsPresentation