Rellich-Kondrachov type theorems on the half-space with general singular weights

This paper establishes necessary and sufficient conditions for the compactness of the embedding Hμw1(HN+1)Lμw2(HN+1)H_{\mu_w}^1(\mathbb{H}^{N+1}) \hookrightarrow L_{\mu_w}^2(\mathbb{H}^{N+1}) on the half-space with general singular weights, proving that compactness holds if and only if the measure has finite mass and satisfies a global tightness condition characterized by coercive tail inequalities and, in singular cases, weighted Hardy inequalities.

Yunfan Zhao, Xiaojing Chen2026-03-10🔢 math

\del\delbar\del\delbar-Lemma and Bott-Chern cohomology of twistor spaces

This paper investigates the Bott-Chern and Aeppli cohomologies of twistor spaces associated with compact self-dual 4-manifolds to characterize the validity of the ˉ\partial\bar{\partial}-lemma, while explicitly computing the Dolbeault cohomology for the twistor space of the flat 4-torus as a specific example where the lemma fails.

Anna Fino, Gueo Grantcharov, Nicoletta Tardini, Adriano Tomassini, Luigi Vezzoni2026-03-10🔢 math

Some remarks on the exponential separation and dimension preserving approximation for sets and measures

This paper advances the dimension theory of sets and measures by weakening Hochman's exponential separation condition, demonstrating the equivalence of modified and original definitions for homogeneous self-similar IFS on R\mathbb{R}, and proving the density of specific subsets defined by Assouad, Hausdorff, and LqL^q dimensions within their respective spaces.

Saurabh Verma, Ekta Agrawal, Megala M2026-03-10🔢 math

A Heuristic Alternating Direction Method of Multipliers Framework for Distributed and Centralized Tree-Constrained Optimization: Applications to Hop-Constrained Spanning Tree Multicommodity Flow Design

This paper proposes centralized and distributed heuristic ADMM frameworks that combine continuous relaxation with efficient tree-projection subproblems to solve large-scale nonconvex multicommodity flow design problems under spanning tree and hop-constraint requirements, yielding near-optimal solutions.

Yacine Mokhtari2026-03-10🔢 math

When Many Trees Go to War: On Sets of Phylogenetic Trees With Almost No Common Structure

This paper establishes that for a set of tt phylogenetic trees with nn leaves, if tt is sufficiently small (specifically to(lgn)t \in o(\sqrt{\lg n})), the trees can be constructed to have virtually no common structure, thereby forcing any network displaying them to require nearly the maximum possible number of reticulations, (t1)no(n)(t-1)n - o(n).

Mathias Weller, Norbert Zeh2026-03-10🔢 math

Γ\Gamma-convergence and stochastic homogenization for functionals in the A\mathcal{A}-free setting

This paper establishes a compactness result for the Γ\Gamma-convergence of integral functionals on A\mathcal{A}-free vector fields to prove stochastic homogenization without periodicity assumptions, demonstrating that the homogenized integrand arises from limits of minimization problems on large cubes and can be explicitly characterized via the subadditive ergodic theorem under stochastic periodicity.

Gianni Dal Maso, Rita Ferreira, Irene Fonseca2026-03-10🔢 math

A classification of Prufer domains of integer-valued polynomials on algebras

This paper provides a complete classification of integrally closed domains DD and finitely generated torsion-free DD-algebras AA for which the ring of integer-valued polynomials IntK(A)\text{Int}_K(A) is a Prüfer domain, proving that in the semiprimitive case, this property holds if and only if AA is a commutative finite direct product of almost Dedekind domains with finite residue fields satisfying specific boundedness conditions.

Giulio Peruginelli, Nicholas J. Werner2026-03-10🔢 math