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1969, Volume 185, Number 3  


MATHEMATICS
The behavior of a generalized solution of a mixed problem for the wave equation in a region which is nearly closed
A. A. Arsen'ev
495
Asymptotics as $t\to\infty$ of certain solutions of a system of two quasilinear equations
V. A. Borovikov
499
The invariance of discrete systems
V. V. Velichenko
503
A priori estimates for first order differential operators
Yu. V. Egorov
507
A condition for the regularity of a Gaussian stationary process
I. A. Ibragimov, V. N. Solev
509
Topological imbedding in $E^3$ of simple arcs and closed contours
L. V. Keldysh
513
Necessary and sufficient conditions for the regularity of a boundary point for the Dirichlet problem for the heat equation
E. M. Landis
517
A boundary projection operator
V. S. Ryaben'kii
521
Double layer iteration schemes
A. A. Samarskii
524

MECHANICS
Optimal synthesis of automatic machines
I. I. Artobolevsky, D. Ya. Il'inskii, I. I. Kapustin
528

FLUID MECHANICS
Structure of a flow with periodic variation of momentum
L. A. Vulis, A. L. Genkin, L. p. Yarin
532
Calculation of the wall turbulence constant
M. A. Goldshtik, S. S. Kutateladze
535
A note on unsteady near-sonic flows
E. V. Mamontov
538

THEORY OF ELASTICITY
Dynamic problem for a plane with a cut
V. Z. Parton, B. A. Kudryavtsev
541

PHYSICS
Negative dispersion of light in the $\mathrm{CaWO}_4:\mathrm{Nd}^{3+}$ crystal
N. K. Bel'skii, D. A. Muhamedova
545
Electron-spin resonance in glass containing two transition elements Cross-relaxation and spin-diffusion processes in some kinds of cobalt-containing glass
L. D. Bogomolova, V. N. Lazukin, N. V. Petrovykh
548
New photographic layers of high resolution and a new method of holographic resolvometry
Yu. A. Bykovskii, A. I. Larkin, A. A. Markilov, R. V. Ryabova, D. M. Samoilovich
552
The synthesis of “carbonade” diamonds
L. F. Vereshchagin, E. N. Yakovlev, T. D. Varfolomeeva, V. N. Slesarev, L. E. Shterenberg
555

GEOPHYSICS
Determination of wave velocity cross-section through Europe's upper mantle
V. P. Valyus, V. I. Keilis-Borok, A. L. Levshin
564
On the asymptotic method of solving Brownian motion equations for aerosol particles
V. M. Voloshchuk
568

CRYSTALLOGRAPHY
Synthesis X-ray and thermographic study of potassium – rare earth tungstatcs, $\mathrm{KLn}(\mathrm{WO}_4)_2$; $\mathrm{Ln}$ – rare – earth elements
P. V. Klevtsov, L. P. Kozeeva
571
A new lanthanum oxytungstate $2\mathrm{La}_2\mathrm{O}_3\cdot3\mathrm{WO}_3$
T. I. Timchenko, L. V. Petushkova, E. A. Pobedimskaya, A. V. Pashkova
575

Поправки к статье “О произведениях, степенях и сужениях гомоморфизмов” (ДАН, т. 181, № 5, 1968 г.)
M. A. Gol'dman, S. N. Krachkovskii
 
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