Positive Operators and an Inertia Theorem.
Applications of Shortest Path Algorithms to Matrix Scalings.
The Bauer Fields of Values of a Matrix.
Comparison theorems for supremum norms.
A Symmetric Numerical Range for Matrices.
The Numerical Range of a Continuous Mapping of a Normed Space
The Numerical Range of a Continuous Mapping of a Normed Space. (Short Communication).
A calculus for finitely satisfiable formulas with identity.
Verallgemeinerung eines Satzes von H. Samelson
Die Struktur von projektiven Moduln.
Semantics of the predicate calculus with identity and the validity in the empty individual-domain
A syntactical characterization of the predicate calculus with identity and the validity in all individual-domains
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