Relative A1\mathbb{A}^1-Contractibility of Smooth Schemes and Exotic Motivic Spheres

This thesis extends the relative A1\mathbb{A}^1-contractibility of Koras-Russell threefolds and their higher-dimensional prototypes to arbitrary Noetherian base schemes, thereby establishing the existence of the first known family of smooth "exotic" motivic spheres in dimensions n4n \geq 4 that are A1\mathbb{A}^1-homotopic to, but not isomorphic to, the punctured affine space An{0}\mathbb{A}^n \setminus \{0\}.

Krishna Kumar Madhavan Vijayalakshmi2026-03-05🔢 math

Statistical Topological Gradient and Shape Optimization for Robust Metal--Semiconductor Contact Reconstruction

This paper presents a statistically robust framework for reconstructing metal–semiconductor contact regions by combining topological gradients with shape optimization, establishing a central limit theorem for convergence and utilizing a key parameter β\beta to refine interface sensitivity and distinguish true structural features from noise.

Lekbir Afraites, Aissam Hadri, Mourad Hrizi + 1 more2026-03-05🔢 math

Optimal strategies in Markov decision processes with finitely additive evaluations

This paper demonstrates that while pure optimal strategies exist in infinite-horizon Markov decision processes with finite state and action spaces under diffuse charges satisfying the time value of money principle, optimal strategies (neither pure nor randomized) may fail to exist entirely if the aggregation charge is constructed without such assumptions.

János Flesch, Arkadi Predtetchinski, William D Sudderth + 1 more2026-03-05🔢 math