Minkowskische und absolute Geometrie I.
Minkowskische und absolute Geometrie II.
Über kritische Gitter im vierdimensionalen Raum (R4).
Ein Beitrag zur Theorie der Ruinwahrscheinlichkeit.
Unique continuation for |Δu| ≤ V |∇u| and related problems.
Much of this paper will be concerned with the proof of the following
Zur Schätzung eines Dichtefunktionals.
Relationen zwischen Symmetrien in orthogonalen Gruppen.
Thin sets in nonlinear potential theory
Let , denote the space of Bessel potentials , , with norm . For integer can be identified with the Sobolev space . One can associate a potential theory to these spaces much in the same way as classical potential theory is associated to the space , and a considerable part of the theory was carried over to this more general context around 1970. There were difficulties extending the theory of thin sets, however. By means of a new inequality, which characterizes the positive cone...
Quasi-constricted linear operators on Banach spaces
Let X be a Banach space over ℂ. The bounded linear operator T on X is called quasi-constricted if the subspace is closed and has finite codimension. We show that a power bounded linear operator T ∈ L(X) is quasi-constricted iff it has an attractor A with Hausdorff measure of noncompactness for some equivalent norm ||·||₁ on X. Moreover, we characterize the essential spectral radius of an arbitrary bounded operator T by quasi-constrictedness of scalar multiples of T. Finally, we prove that every...
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