Vol. 30, No. 4, 2025

Regular and Chaotic Dynamics

Valery V. Kozlov On the Occasion of his 75th Birthday

Spinning Top in Quadratic Potential and Matrix Dressing Chain

Vsevolod E. Adler, and Alexander P. Veselov p. 464 abstract

Lyapunov Exponents of Linear Switched Systems

Andrei A. Agrachev, and Michele Motta p. 481 abstract

The Lorentzian Anti-de Sitter Plane

Anton Z. Ali, and Yuri L. Sachkov p. 504 abstract

Singular KAM Theory for Convex Hamiltonian Systems

Santiago Barbieri, Luca Biasco, Luigi Chierchia, and Davide Zaccaria p. 538 abstract

Infinite-Dimensional and Field-Theoretic Nonholonomic Mechanics

Anthony M. Bloch, and Dmitry V. Zenkov p. 550 abstract

On the Picard – Lindelöf Argument and the Banach – Caccioppoli Contraction Mapping Principle

Alexander I. Bufetov, and Ilya I. Zavolokin p. 566 abstract

Integrability of Homogeneous Exact Magnetic Flows on Spheres

Vladimir Dragović, Borislav Gajić, and Božidar Jovanović p. 582 abstract

Poncelet Porism in Singular Cases

Vladimir Dragović, and Milena Radnović p. 598 abstract

The Ozawa Solution to the Davey – Stewartson II Equations and Surface Theory

Yi C. Huang, and Iskander A. Taimanov p. 612 abstract

Functional Invariants in Semilocal Bifurcations

Yulij S. Ilyashenko p. 618 abstract

Rolling of a Homogeneous Ball on a Moving Cylinder

Alexander A. Kilin, Elena N. Pivovarova, and Tatiana B. Ivanova p. 628 abstract

Symplectic Classification for Universal Unfoldings of \(A_{n}\) Singularities in Integrable Systems

Elena A. Kudryavtseva p. 639 abstract

On Oscillations in a Neighborhood of Lagrangian Libration Points in One Resonance Case

Anatoly P. Markeev p. 666 abstract

Real Analyticity of 2-Dimensional Superintegrable Metrics and Solution of Two Bolsinov – Kozlov – Fomenko Conjectures

Vladimir S. Matveev p. 677 abstract

Billiard Trajectories inside Cones

Andrey E. Mironov, and Siyao Yin p. 688 abstract

Nonsingular Flows with a Twisted Saddle Orbit on Orientable 3-Manifolds

Olga V. Pochinka, and Danila D. Shubin p. 711 abstract

Metric Geometry and Forced Oscillations in Mechanical Systems

Ivan Yu. Polekhin p. 732 abstract

On Tensor Invariants of the Clebsch System

Andrey V. Tsiganov p. 742 abstract