RUS  ENG Full version

This issue is dedicated to the 80th anniversary of the journal

	Topology, singularities and integrability in Hamiltonian systems with two degrees of freedom S. V. Bolotin, V. V. Kozlov		3
	Integrable topological billiards and equivalent dynamical systems V. V. Vedyushkina (Fokicheva), A. T. Fomenko		20
	Universal adic approximation, invariant measures and scaled entropy A. M. Vershik, P. B. Zatitskii		68
	Many-circuit canard trajectories and their applications S. D. Glyzin, A. Yu. Kolesov, N. Kh. Rozov		108
	Grothendieck–Verdier duality patterns in quantum algebra Yu. I. Manin		158
	A criterion for semiampleness V. V. Shokurov		167