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1987, Volume 293, Number 2  


MATHEMATICS
Embedding theorems and the convergence of multiple Fourier series
Ya. S. Bugrov
265
On the convergence of spectral expansions at the point of discontinuity of the coefficients of a second-order linear nonselfadjoint differential operator
V. D. Budaev
270
Continuity of a family of trajectories of linear control systems with respect to singular perturbations
V. M. Veliov, A. L. Donchev
274
The Wiener–Hopf equation on the half-axis in Nevanlinna and Smirnov algebras
V. S. Vladimirov
278
A solution of Proizvolov's problem of covering a multidimensional polyhedron by pyramids, and its generalizations
G. A. Gal'perin
283
Hypergeometric functions connected with the Grassmannian $G_{3{,}6}$
I. M. Gel'fand, M. I. Graev
288
A proof of the Deligne–Langlands conjecture
V. A. Ginzburg
293
The condition of simplicity for the spectrum of Lyapunov exponents
I. Ya. Gol'dsheid, G. A. Margulis
297
On two problems for a hyperbolic equation in the characteristic triangle
N. Yu. Kapustin
301
Second-order quasilinear parabolic equations with integral coefficients
G. I. Laptev
306
On spectral expansions corresponding to selfadjoint extensions of some singular elliptic operators
A. A. Larin
309
Reconstruction of a proof by its scheme
V. P. Orevkov
313

FLUID MECHANICS
Rheological model of a viscoelastic liquid with three-stage thixotropy
V. T. Kharin
317

GEOPHYSICS
Reciprocity relations for waves in a compressible fluid
O. A. Godin
322
Local bimodal fragment-size distribution law in explosive fracturing of rocks
B. V. Zamyshlyaev, L. S. Evterev, V. M. Loborev, V. A. Cherneikin
326
The influence of the elastic medium inhomogeneity on the excitation of shear waves by a cylindrical emitter
A. P. Kiselev
330
Laws of the Brownian coagulation in the system with changing concentration of disperse phase
A. G. Sutugin
332

MATHEMATICAL PHYSICS
On the solution of the inverse potential problem for polyhedra with variable polynomial densities
M. A. Brodskii, V. N. Strakhov
336
Conditionally stationary initial-boundary value problems in reactor dynamics
N. S. Kellin
339
Wave scattering by an unclosed cylindrical screen of arbitrary profile with the Neumann boundary condition
Yu. A. Tuchkin
343

CRYSTALLOGRAPHY
Methods of integral geometry and the determination of the mutual orientation of identical particles, arbitrarily situated in a plane, from their projections on a line
A. B. Goncharov
355
Crystal structure $\mathrm{CsLiWO}_4$
V. Petrichek, Ya. Fabry, A. M. Golubev, V. I. Simonov, K. S. Aleksandrov
358
 
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