Mat. Zametki, 1991, Volume 49, Issue 6

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1991, Volume 49, Issue 6

	Smoothness of solutions of second-order hyperbolic equations with discontinuous coefficients V. N. Aref'ev	3–11
	Summation of multiple trigonometric Fourier series R. R. Ashurov	12–18
	Properties of the spectral function of a Sturm–Liouville operator with discontinuous coefficients A. B. Budak, V. N. Denisov	19–28
	Three-dimensional hyperbolic manifolds with general fundamental polyhedron A. Yu. Vesnin	29–32
	Approximation of functions of class $C(\varepsilon)$ by sequences of de la Vallée-Poussin sums O. V. Davydov	33–41
	Multi-phase solutions of the Benjamin–Ono equation and their averaging S. Yu. Dobrokhotov, I. M. Krichever	42–58
	$C^r$-property and approximately differentiable functions N. M. Isakov	59–62
	1-cohomologies of a special linear group with coefficients in a module of truncated polynomials A. S. Kleshchev	63–71
	Approximations of compact sets of functions by piecewise polynomial surfaces in spaces of smooth functions S. N. Kudryavtsev	72–81
	Estimates of the singular numbers of Hankel operators O. G. Parfenov	82–86
	Functionally balanced groups I. V. Protasov	87–91
	Periodic solutions of difference Runge–Kutta schemes V. I. Rozhkov, A. M. Popov	92–97
	Connection between the mixing properties of a flow and the isomorphicity of the transformations that compose it V. V. Ryzhikov	98–106
	Fourier–Maslov transform in the space of multivalued analytic functions B. Yu. Sternin, V. E. Shatalov	107–118
	Properties of integral solutions of differential inclusions with $m$-accretive operators A. A. Tolstonogov	119–131

Brief Communications
	Best quadrature formulas for improper integrals on certain classes of differentiable functions D. B. Bazarkhanov	132–134
	A pseudo-Euclidean representation of conditionally positive mappings V. P. Belavkin	135–137
	Nonrecursiveness of the integral of a conditionally periodic function N. G. Moshchevitin	138–140
	Integration of Hamiltonian systems on a separate isoenergetic surface G. G. Okuneva	140–142
	Optimal control by random sequences with constraints A. B. Piunovskiy, V. M. Khametov	143–145
	$\mathscr C$-spectral sequence of evolution equations N. G. Khor'kova	145–147

	Letter to the editor S. Yu. Orevkov	148

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