On canonical bundle formula for fibrations of curves with arithmetic genus one

This paper establishes canonical bundle formulas for fibrations of curves with arithmetic genus one in characteristic p>0p>0, distinguishing between separable and inseparable cases, and applies these results to prove that a klt pair with a nef anti-log canonical divisor and a relative dimension one Albanese morphism is a fiber space over its Albanese variety.

Jingshan Chen, Chongning Wang, Lei Zhang2026-03-06🔢 math

Learning Risk Preferences in Markov Decision Processes: an Application to the Fourth Down Decision in the National Football League

This paper employs an inverse optimization framework on NFL play-by-play data to demonstrate that coaches' historically conservative fourth-down decisions are consistent with optimizing low quantiles of future value, revealing that their risk preferences have become more tolerant over time and vary based on field position.

Nathan Sandholtz, Lucas Wu, Martin Puterman + 1 more2026-03-06🔢 math

Invariants of surfaces in smooth 4-manifolds from link homology

This paper constructs analogs of Khovanov-Jacobsson classes and the Rasmussen invariant for links in the boundary of smooth oriented 4-manifolds by utilizing skein lasagna modules derived from equivariant and deformed glN\mathfrak{gl}_N link homology, while establishing non-vanishing results, decomposition theorems, and conditions for extending functoriality to immersed cobordisms.

Kim Morrison, Kevin Walker, Paul Wedrich2026-03-06🔢 math

Gersten-type conjecture for henselian local rings of normal crossing varieties

This paper proves a Gersten-type conjecture for étale sheaves, including étale logarithmic Hodge-Witt sheaves and ll-adic Tate twists, over henselian local rings of normal crossing varieties in positive characteristic, and applies this result to establish a relative version of the conjecture for pp-adic étale Tate twists over semistable families in mixed characteristic as well as a generalization of Artin's theorem on Brauer groups.

Makoto Sakagaito2026-03-06🔢 math

Data Collaboration Analysis with Orthonormal Basis Selection and Alignment

This paper introduces Orthonormal Data Collaboration (ODC), a method that enforces orthonormal bases to transform the alignment challenge into a closed-form Orthogonal Procrustes problem, thereby achieving orthogonal concordance, significantly reducing computational complexity, and improving accuracy without compromising privacy or communication efficiency.

Keiyu Nosaka, Yamato Suetake, Yuichi Takano + 1 more2026-03-06🔢 math

Localized Distributional Robustness in Submodular Multi-Task Subset Selection

This paper proposes a novel multi-task subset selection framework that achieves localized distributional robustness by introducing a relative-entropy regularization term, which is proven equivalent to maximizing a monotone composition of submodular functions and can be efficiently solved via greedy algorithms, as validated by experiments on satellite sensor selection and image summarization.

Ege C. Kaya, Abolfazl Hashemi2026-03-06🔢 math

Some facts about the optimality of the LSE in the Gaussian sequence model with convex constraint

This paper characterizes the necessary and sufficient conditions for the least squares estimator to be minimax optimal in a convex constrained Gaussian sequence model by linking optimality to the Lipschitz property of the local Gaussian width, while providing algorithms to compute worst-case risk and demonstrating these results across various geometric sets.

Akshay Prasadan, Matey Neykov2026-03-06🔢 math

Variational inequalities and smooth-fit principle for singular stochastic control problems in Hilbert spaces

This paper establishes that the value function of infinite-dimensional singular stochastic control problems in Hilbert spaces is a C1,Lip(H)C^{1,\mathrm{Lip}}(H)-viscosity solution to a variational inequality and satisfies a second-order smooth-fit principle in the controlled direction under specific spectral conditions, by leveraging connections to optimal stopping and techniques from convex and viscosity theory.

Salvatore Federico, Giorgio Ferrari, Frank Riedel + 1 more2026-03-06🔢 math

On the smoothing theory delooping of disc diffeomorphism and embedding spaces

This paper generalizes the classical Morlet-Burghelea-Lashof-Kirby-Siebenmann smoothing theory delooping of disc diffeomorphism groups to various disc embedding spaces, establishing their equivalence to specific loop spaces of quotient classifying spaces and demonstrating how these deloopings unify Hatcher and Budney group actions into a framed little discs operad action.

Paolo Salvatore, Victor Turchin2026-03-06🔢 math