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1975, Volume 221, Number 6  


MATHEMATICS
On the adjunction of a boundary to a regular covering of a closed manifold
A. L. Brahman
1249
Conditions that the Cauchy problem for hyperbolic operators with characteristics of variable multiplicity be well posed in Gevrey classes
V. Ya. Ivrii
1253
A hierarchical semantic system with set variables
M. I. Kanovitch
1256
Singular convolution operators with a discontinuous symbol
N. K. Karapetyants, S. G. Samko
1260
The number of automata and boundedly determined functions. Hereditary properties of automata
A. D. Korshunov
1264
Cooperation of models of economic dynamics
I. A. Krass
1268
On the stability of a class of matrices arising in the mathematical theory of biological associations
D. O. Logofet
1272
The Markov property of Levy fields on spaces of constant curvature
G. M. Molchan
1276
On the Riemann boundary-value problem with Hermitian matrix
A. M. Nikolaichuk, I. M. Spitkovsky
1280
On varieties of automata
B. I. Plotkin, C. E. Dididze, E. M. Kublanova
1284
Linear representations of evolution differential equations
O. G. Smolyanov
1288
On the first boundary-value problem for a degenerate parabolic equation
S. A. Tersenov
1292

CYBERNETICS AND THE REGULATION THEORY
Approximate method of analysis of linear stochastic systems for a class of automatic controls
V. A. Kiselev
1296

PHYSICS
Focusing of acoustic waves of finite amplitude
L. A. Ostrovsky, A. M. Sutin
1300

GEOPHYSICS
Spectrophotometers of the Earth from the “Soyuz-13” manned spacecraft
A. A. Buznikov, P. I. Klimuk, K. Ya. Kondrat'ev, V. V. Lebedev, V. M. Orlov
1310
Excitation of geomagnetic pulsations of the “serpantine-emission”-type in the interplanetary plasma
A. V. Guglielmi, B. V. Dovbnya, B. I. Klain
1314
Prognostic aspect of the seismic wave double radiation
B. G. Rulev
1318

CRYSTALLOGRAPHY
Crystal structure of $\mathrm{NaFe}(\mathrm{MoO}_4)_2$
R. F. Klevtsova
1322
Crystal structure of roweite, $\mathrm{Ca}_2(\mathrm{Mn}_{0,52}\mathrm{Mg}_{0,48})_2[\mathrm{B}_4\mathrm{O}_7(\mathrm{OH})_2](\mathrm{OH})_4$
N. A. Yamnova, M. A. Simonov, N. V. Belov
1326
 
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