A hybrid reduced-order and high-fidelity discontinuous Galerkin Spectral Element framework for large-scale PMUT array simulations

This paper presents a novel, scalable computational framework implemented in the open-source SPEED software that combines model order reduction with a high-fidelity Discontinuous Galerkin Spectral Element Method to efficiently simulate the coupled electromechanical-acoustic behavior of large-scale Piezoelectric Micromachined Ultrasonic Transducer (PMUT) arrays.

Paola F. Antonietti, Omer M. O. Abdalla, Michelangelo G. Garroni, Ilario Mazzieri, Nicola Parolini2026-03-09🔢 math

Homogeneity of the Lévy collapse from the perspective of Fraïssé theory

This paper establishes that the Fraïssé limit of the class of Boolean algebras of size less than a strongly inaccessible cardinal λ\lambda (under regular embeddings) shares the same completion as the Lévy collapse, while also providing a direct proof that the collapsing algebra of density κ\kappa cannot be expressed as the union of a κ\kappa-chain of regular sub-algebras of density less than κ\kappa.

Ziemowit Kostana2026-03-09🔢 math

Solving the Line-Based Dial-a-Ride Problem by Generating Stopping Patterns

This paper introduces a new variant of the line-based dial-a-ride problem without time windows, proposes a novel MILP formulation and a branch-and-price algorithm based on generating profitable stopping patterns, and demonstrates through computational experiments that both the exact method and a scalable root node heuristic effectively solve large instances with high efficiency and small optimality gaps.

Antonio Lauerbach, Sven Mallach, Kendra Reiter, Marie Schmidt, Michael Stiglmayr2026-03-09🔢 math