Vestnik Moskov. Univ. Ser. 1. Mat. Mekh., 2021, Number 4

JOURNALS // Vestnik Moskovskogo Universiteta. Seriya 1. Matematika. Mekhanika // Archive

2021, Number 4

Mathematics
	A new estimate of double Fourier coefficients for functions of bounded generalized variation N. A. Zhukovskii	3
	Functions preserving metrics and Gromov–Hausdorff space V. M. Chikin	11
	An existence criterion for maximizers of convolution operators in $L_1(\mathbb{R}^n)$ G. V. Kalachev, S. Yu. Sadov	17

Mechanics
	Bulgakov problem for a hyperbolic equation and robust stability V. N. Zhermolenko, R. Temoltzi-Avila	23
	Short-wave instability of one-dimensional radiative-convective models of the atmosphere using a quasi-hydrostatic approach X. Xu	30
	Controlled transfer in a model of biomass dynamics of root plants V. V. Aleksandrov, T. B. Alexandrova, L. Cruzado Lima, J. A. Escamilla Reyna	35

Short notes
	Reduction of a functional integral over discontinuous trajectories to integrals over continuous trajectories E. S. Kolpakov	41
	Action of free commuting involutions on closed two-dimensional manifolds T. Yu. Neretina	44
	Orbital invariants of flat billiards bounded by arcs of confocal quadrics and containing focuses V. V. Vedyushkina	48
	Simplification of the calculation of characteristic frequencies over nonuniform scales A. N. Korolev	51
	Effect of surface for es on diffusion in a liquid at the initial time interval of film evolution A. N. Beloglazkin, V. Ya. Shkadov	55

	Oktay Muradoviсh Kasim-Zade (29.04.1953–22.12.2020) S. B. Gashkov, O. S. Dudakova, M. D. Kovalev, R. M. Kolpakov, V. V. Kochergin, N. P. Red'kin, A. T. Fomenko, A. V. Chashkin, V. N. Chubarikov, A. I. Shafarevich, A. D. Yashunskii	60