Still another proof of the existence of Sylow--subgroups.
On lifting prime ideals.
A simple, (almost) non-inductive proof for the existence of composite fields and algebraic closures.
Valuated matroids---a new look at the greedy algorithm.
An application of Burnside rings in elementary finite group theory.
On Signatures of Green Functors.
A combinatorial theory of Grünbaum's new regular polyhedra, Part II: Complete enumeration.
A combinatorial theory of Grünbaum's new regular polyhedra, Part I: Grünbaum's new regular polyhedra and their automorphism group.
On Prime Ideals in Representation Rings.
Gated sets in metric spaces.
Zur Parametrisierung von Untergruppen freier Gruppen
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