Spectral Theory of the Dirac Operator.
Boundary Behaviour of Dirchlet Eigenfunctions of Second Order Elliptic Operators.
Two-sided estimates of the approximation numbers of certain Volterra integral operators
We consider the Volterra integral operator defined by . Under suitable conditions on u and v, upper and lower estimates for the approximation numbers of T are established when 1 < p < ∞. When p = 2 these yield . We also provide upper and lower estimates for the and weak norms of (an(T)) when 1 < α < ∞.
Two-sided estimates for the approximation numbers of Hardy-type operators in and L¹
In [2] and [3] upper and lower estimates and asymptotic results were obtained for the approximation numbers of the operator defined by when 1 < p < ∞. Analogous results are given in this paper for the cases p = 1,∞ not included in [2] and [3].
A discrete Hardy-Laptev-Weidl-type inequality and associated Schrödinger-type operators.
On Solutions of a Differential Equation which are not of Integrable Square.
On the Limit-Point and Strong Limit-Point Classification of 2 n-th Order Differential Expressions with Widly Oscillating Coefficients.
Elliptic and degenerate-elliptic operators in unbounded domains
Finiteness of bound states of general -body operators
Sharp estimates of the embedding constants for Besov spaces.
Sharp estimates are obtained for the rates of blow up of the norms of embeddings of Besov spaces in Lorentz spaces as the parameters approach critical values.
The HELP inequality for Hamiltonian systems.
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