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 Mat. Zametki: Year: Volume: Issue: Page: Find

 1991, Volume 49, Issue 6

 Smoothness of solutions of second-order hyperbolic equations with discontinuous coefficientsV. N. Aref'ev 3 Summation of multiple trigonometric Fourier seriesR. R. Ashurov 12 Properties of the spectral function of a Sturm–Liouville operator with discontinuous coefficientsA. B. Budak, V. N. Denisov 19 Three-dimensional hyperbolic manifolds with general fundamental polyhedronA. Yu. Vesnin 29 Approximation of functions of class $C(\varepsilon)$ by sequences of de la Vallée-Poussin sumsO. V. Davydov 33 Multi-phase solutions of the Benjamin–Ono equation and their averagingS. Yu. Dobrokhotov, I. M. Krichever 42 $C^r$-property and approximately differentiable functionsN. M. Isakov 59 1-cohomologies of a special linear group with coefficients in a module of truncated polynomialsA. S. Kleshchev 63 Approximations of compact sets of functions by piecewise polynomial surfaces in spaces of smooth functionsS. N. Kudryavtsev 72 Estimates of the singular numbers of Hankel operatorsO. G. Parfenov 82 Functionally balanced groupsI. V. Protasov 87 Periodic solutions of difference Runge–Kutta schemesV. I. Rozhkov, A. M. Popov 92 Connection between the mixing properties of a flow and the isomorphicity of the transformations that compose itV. V. Ryzhikov 98 Fourier–Maslov transform in the space of multivalued analytic functionsB. Yu. Sternin, V. E. Shatalov 107 Properties of integral solutions of differential inclusions with $m$-accretive operatorsA. A. Tolstonogov 119 Brief Communications Best quadrature formulas for improper integrals on certain classes of differentiable functionsD. B. Bazarkhanov 132 A pseudo-Euclidean representation of conditionally positive mappingsV. P. Belavkin 135 Nonrecursiveness of the integral of a conditionally periodic functionN. G. Moshchevitin 138 Integration of Hamiltonian systems on a separate isoenergetic surfaceG. G. Okuneva 140 Optimal control by random sequences with constraintsA. B. Piunovskiy, V. M. Khametov 143 $\mathscr C$-spectral sequence of evolution equationsN. G. Khor'kova 145 Letter to the editorS. Yu. Orevkov 148