Einschließungsaussagen bei Differentialoperatoren zweiter Ordnung durch punktweise Ungleichungen

Summary We consider non-inverse positive differential operators of the second order and show that error estimates can be obtained through methods of inverse positivity alone. This means a significant simplification if the operator has only one negative eigenvalue. In addition we show how to obtain Range-Domain implications for operators with mixed boundary conditions.

The author would like to thank the European Research Office of the United States Army for their kind interest