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1971, Volume 198, Number 2  


MATHEMATICS
On the convergence of difference approximations of the eigenvalues and eigenfunctions of a two-dimensional elliptic operator
Yu. N. Valitskii
263
On groups with certain properties of subgroups
V. A. Vedernikov
266
The generation of semigroup-generalized functions of endomorphisms of a locally convex space
Yu. M. Vuvunikyan
269
On the theory of discrete optimization
V. A. Emelichev
273
Realization theorems for abstract projective spectra
V. Zaitsev
277
Differential equations, with multiple characteristics, that have no solutions
V. Ya. Ivrii
279
On domains of definition of optimal algorithms
M. I. Kanovitch
283
On the periodic solutions of a system of ordinary differential equations with singularities
I. T. Kiguradze
286
On a linear combination of functions of several variables best approximated by a sum of functions of a smaller number of variables
V. M. Mordashev
290
Limit theorems for the sample coefficients of asymmetry and excess
A. V. Nagaev
291
On the decomposition of a permutation group over a characteristic field
A. I. Saksonov
293
On the group of 1-chains of a topological group
S. S. Sannikov
297
A remark on marginal sufficiency
V. N. Sudakov
301

CYBERNETICS AND THE REGULATION THEORY
Operative-production planning and control of a complex chemico technological system
V. V. Kafarov, G. B. Lazarev, V. I. Avdeev
303
Optimal stabilization of several plant coordinates by a single controlling action
V. B. Larin, K. I. Naumenko, V. N. Suntsev
307

MECHANICS
Rayleigh surface waves in a viscoelastic medium
S. Z. Bruk
310

FLUID MECHANICS
Impact of a conical shell against water
È. I. Grigolyuk, A. G. Gorshkov
313

THEORY OF ELASTICITY
Description of the effect of finite deformations on the velocity of propagation of elastic waves
A. N. Guz, F. G. Makhort
316

ASTRONOMY
The method of solar flare prediction as a function of many variables
V. L. Brailovsky, I. Yu. Brailovskaya
319

MATHEMATICAL PHYSICS
A method of the solution to boundary value problems for heat transfer in a region with boundary moving according to a random law
B. Ya. Lubov, È. M. Kartashov
323

GEOPHYSICS
On global circulation in barotropic ocean of variable depth
D. L. Laikhtman, B. A. Kagan, L. A. Oganesyan, R. V. Pyaskovskii
333
Some estimates of electric conductivity and temperature of the upper mantle according to magnetic variation data
I. I. Rokityansky
337
 
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