Russian Universities Reports. Mathematics: Latest issue http://www.mathnet.ru/eng/vtamu 2026, Volume 31, Issue Issue 154 en-gb Copyright 2026, Tue, 30 Jun 2026 00:00:00 +0300 math-net2026_07@mi-ras.ru tche@mi-ras.ru Russian Universities Reports. Mathematics http://www.mathnet.ru/JrnLogos/vtamu/vtamu_2021_big.jpg http://www.mathnet.ru/eng/vtamu On the optimality conditions for the problem of maximizing the minimum frequency of a rotation shell for a given weight M. Arabyan, Z. B. Hovhannesyan Russian Universities Reports. Mathematics, 2026, 31:154, 105--114 http://mi.mathnet.ru/eng/vtamu381 Tue, 30 Jun 2026 00:00:00 +0300 Tue, 30 Jun 2026 00:00:00 +0300 http://mi.mathnet.ru/eng/vtamu381 Proof of the convexity of the function $L(\sigma,T)$ for small $T$ and the Riemann hypothesis V. M. Blinovskii, A. N. Pchelintsev Russian Universities Reports. Mathematics, 2026, 31:154, 115--127 http://mi.mathnet.ru/eng/vtamu382 Tue, 30 Jun 2026 00:00:00 +0300 Tue, 30 Jun 2026 00:00:00 +0300 http://mi.mathnet.ru/eng/vtamu382 On a spectral problem for a coupled system of second-order ordinary differential equations with nonlocal weighted integral boundary conditions A. Zekri Russian Universities Reports. Mathematics, 2026, 31:154, 128--141 http://mi.mathnet.ru/eng/vtamu383 Tue, 30 Jun 2026 00:00:00 +0300 Tue, 30 Jun 2026 00:00:00 +0300 http://mi.mathnet.ru/eng/vtamu383 Acceleration of convergence of the piecewise Newton method to singular solutions of nonlinear equations A. F. Izmailov, Zh. Yan Russian Universities Reports. Mathematics, 2026, 31:154, 142--167 http://mi.mathnet.ru/eng/vtamu384 Tue, 30 Jun 2026 00:00:00 +0300 Tue, 30 Jun 2026 00:00:00 +0300 http://mi.mathnet.ru/eng/vtamu384 Stochastic finite-difference schemes for nondifferentiable quasiconvex optimization: convergence rate R. A. Khachatryan Russian Universities Reports. Mathematics, 2026, 31:154, 168--185 http://mi.mathnet.ru/eng/vtamu385 Tue, 30 Jun 2026 00:00:00 +0300 Fri, 26 Jun 2026 00:00:00 +0300 http://mi.mathnet.ru/eng/vtamu385 A new nonlinear Volterra integro-differential equation involving a weakly singular temporal peridynamic operator A. Khellaf, S. Lemita, M. Benssaad, S. Benarab Russian Universities Reports. Mathematics, 2026, 31:154, 186--203 http://mi.mathnet.ru/eng/vtamu386 Tue, 30 Jun 2026 00:00:00 +0300 Tue, 30 Jun 2026 00:00:00 +0300 http://mi.mathnet.ru/eng/vtamu386 Analytical solution of a two-component reaction-diffusion system with a reversible chemical reaction in the case of distinct diffusion coefficients O. E. Yaremko, N. N. Yaremko Russian Universities Reports. Mathematics, 2026, 31:154, 204--212 http://mi.mathnet.ru/eng/vtamu387 Tue, 30 Jun 2026 00:00:00 +0300 Tue, 30 Jun 2026 00:00:00 +0300 http://mi.mathnet.ru/eng/vtamu387