Cotilting modules and bimodules (original) (raw)

This paper presents an extension of results regarding linear partial differential operators with constant coefficients that possess continuous linear right inverses. Using polynomial properties, the authors establish equivalent conditions for operators involving perturbations of lower degree and specifically outline implications for principal type operators. The role of quasihomogeneity and the existence of real singular points in determining the behavior of these operators under various perturbations is a central theme.