Level of regions for deformed braid arrangements.

Counting flows of b-compatible graphs.

New perspectives on polynomial invariants.

Adjoints of matroids.

Modifications of hyperplane arrangements.

Whitney numbers of matroid extensions and co-extensions.

Bijections on <i>r</i>-Shi and <i>r</i>-Catalan arrangements.

Parallel translates of represented matroids.

Leading coefficients of Morris type constant term identities.