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Open access Aug 2026

On Generic \(\Delta\)-Modular Integer Matrices with Two Rows

Abstract. The column number question asks for the maximum number of columns of an integer matrix with the property that all its rank size minors are bounded by a fixed parameter [Formula: see text] in absolute value. Polynomial upper bounds have been proved in various settings in recent years, with consequences for al...

Bjorn Kriepke, Matthias Schymura · 0 citations
Preprint Sep 2026

On the Strong Matroid Secretary Conjecture and Beyond

The strong matroid secretary conjecture asserts that every matroid admits a $1/e$-competitive secretary algorithm, matching the classical single-choice guarantee. We formulate a finite linear program whose value is the optimal ordinal competitive ratio of any fixed matroid; for all matroids of positive rank on seven el...

Hamed Abdi, Kiarash Banihashem, Mohammadtaghi Hajiaghayi et al. · 6 citations · ⚡1
Preprint Sep 2026

Approximate Polynomial Satisfiability is in the Counting Hierarchy

The Approximate polynomial satisfiability problem (APS), introduced by Guo, Saxena, and Sinhababu (CCC 2018), asks whether the zero vector lies in the Zariski closure of the image of a given polynomial map. Specifically, for a field $k$ with algebraic closure~$K$, the problem asks whether $\boldsymbol 0 \in\overline{\b...

N. Balaji, M. Shirmohammadi, Sébastien Tavenas et al. · 0 citations
Preprint Sep 2026

Parameterized Complexity of Spanner Problems with Independent Weights and Lengths

In this paper, the parameterized complexity of the multiplicative $\alpha$-spanner problem with independent weights and lengths on undirected graphs is considered for the first time. All prior FPT results (except one on DAGs) assume basic instances (i.e., with unit weights and lengths) and are parameterized in the stre...

Marius Bächler, Markus Chimani, Henning Jasper · 0 citations
Preprint Aug 2026

Weighted Equitability and Matroid-Constrained Discrepancy

We prove weighted matroid equitability. Let $M=(E,\mathcal{I})$ be a matroid whose ground set can be partitioned into $k$ bases, and assign a nonnegative weight to every element. Then $E$ has a partition into $k$ bases such that the weights of any two bases differ by at most the largest element weight. We present two p...

Kristóf Bérczi, Si-Yue Liu, Victor Reis et al. · 0 citations
Preprint Sep 2026

The Strong Secretary Conjecture is True for Linear Matroids

We prove a $1/e$ guarantee for the matroid secretary problem on linear matroids, therefore settling the strong secretary conjecture in this class of matroids. The result holds both when the matroid is known in advance and when a linear representation over a finite field is given online. In the known-matroid model, the...

Kristóf Bérczi, S. Dughmi, V. Livanos et al. · 5 citations

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