On the Realization of Convex Polytopes, Euler's Formula and Möbius Functions
On the union of matching matroids
One-adhesive polymatroids
Adhesive polymatroids were defined by F. Matúš motivated by entropy functions. Two polymatroids are adhesive if they can be glued together along their joint part in a modular way; and are one-adhesive, if one of them has a single point outside their intersection. It is shown that two polymatroids are one-adhesive if and only if two closely related polymatroids have joint extension. Using this result, adhesive polymatroid pairs on a five-element set are characterized.
Oriented matroids in terms of order functions.
Oriented matroids today.
Oriented Matroids with Few Mutations.
Ovals and non-ovoidal Laguerre planes.