The W-footrule coefficient: A copula-based measure of countermonotonicity

This paper introduces the WW-footrule coefficient, a new copula-based measure of negative association defined as the L1L^1-distance to the countermonotonic copula, establishes its theoretical relationship with Gini's gamma and Spearman's footrule, and provides a statistically rigorous rank-based estimator with proven consistency and asymptotic normality.

Enrique de Amo, David García-Fernández, Manuel Úbeda-Flores2026-03-10🔢 math

WKB-asymptotics for multipoint Virasoro conformal blocks and applications

This paper derives WKB-asymptotic expressions for multipoint Virasoro conformal blocks in the comb channel on the sphere by applying the WKB method to the classical BPZ equation, validating the results against known exact solutions and AGT correspondence while demonstrating their utility for generalizing Zamolodchikov's elliptic recursion and numerically evaluating minimal string theory amplitudes.

Aleksandr Artemev, Dmitry Khromov2026-03-10🔢 math

Caveats on formulating finite elasto-plasticity in curvilinear coordinates

This paper presents a practical, step-by-step methodology for formulating finite elasto-plasticity in curvilinear coordinates using explicit basis changes rather than differential geometry, clarifying the treatment of deformation gradients, Jacobians, and shifters to enable robust finite element analysis of axisymmetric problems with large deformations.

Giuliano Pretti, Robert E. Bird, William M. Coombs, Charles E. Augarde2026-03-10🔢 math