Relative boundedness and compactness theory for second-order differential operators.
Some Opial, Lyapunov, and de la Valée Poussin inequalities with nonhomogeneous boundary conditions.
Sufficient conditions for weighted Gabushin inequalities
Two separation criteria for second order ordinary or partial differential operators
We generalize a well-known separation condition of Everitt and Giertz to a class of weighted symmetric partial differential operators defined on domains in . Also, for symmetric second-order ordinary differential operators we show that where is a singular point guarantees separation of on its minimal domain and extend this criterion to the partial differential setting. As a particular example it is shown that is separated on its minimal domain if is superharmonic. For the criterion...
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