Itogi Nauki i Tekhniki. Sovrem. Mat. Pril. Temat. Obz., 2021, Volume 196

Itogi Nauki i Tekhniki. Sovremennaya Matematika i ee Prilozheniya. Tematicheskie Obzory

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2021, Volume 196

Contents

Differential Equations and Optimal Control

	Investigation of Beltrami fields by methods of integral geometry A. L. Balandin		3–14
	Improvement methods for problems of optimal control of multistage processes V. A. Baturin, S. Cheremnykh		15–27
	Chebyshev approximations do not need the Haar condition V. I. Zorkal'tsev		28–35
	On solutions of the traveling wave type for the nonlinear heat equation A. L. Kazakov, P. A. Kuznetsov, L. F. Spevak		36–43
	On the stability of coupled nonlinear oscillators A. A. Kosov		44–49
	Algebraic approach to the construction of the wave equation for particles with spin 3/2 Yu. A. Markov, M. A. Markova, A. I. Bondarenko		50–65
	Simplified three-dimensional mathematical models of hydrodynamics and passive mass transfer in calm channel flows K. A. Nadolin		66–89
	On the solvability of a degenerate hybrid system P. S. Petrenko		90–97
	On the existence of periodic solutions of a fourth-order nonlinear system of parabolic equations A. A. Kosov, È. I. Semenov		98–104
	The Cauchy problem for a degenerate operator-differential system of a special form in Banach spaces O. V. Slastnaya		105–113
	Elements of global search in the general d.c. optimization problem A. S. Strekalovskii		114–127