# matroid

## Aharoni-Berger conjecture ★★★

**Conjecture**If are matroids on and for every partition of , then there exists with which is independent in every .

Keywords: independent set; matroid; partition

## Bases of many weights ★★★

Let be an (additive) abelian group, and for every let .

**Conjecture**Let be a matroid on , let be a map, put and . Then

## Rota's unimodal conjecture ★★★

Author(s): Rota

Let be a matroid of rank , and for let be the number of closed sets of rank .

**Conjecture**is unimodal.

**Conjecture**is log-concave.

Keywords: flat; log-concave; matroid