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1967, Volume 177, Number 6  


MATHEMATICS
Extension of mappings of toplogical spaces
N. V. Velichko
1255
A limit theorem for the number of level crossings by a stationary Gaussian process
M. P. Ershov
1259
Certain criteria for the non-oscillation of linear differential operators
G. S. Zaitseva
1263
Singular Cauchy and Tricomi problems
M. B. Kapilevich
1265
A maximum principle for hyperbolic equations and its application to equations of mixed type
M. E. Lerner
1269
A method of regularizing singular perturbations
S. A. Lomov
1273
Regularization of the Cauchy problem for pseudo-differential equations
V. P. Maslov
1277
An application of the method of the contour integral to the solution of mixed problems for a certain parabolic system
M. L. Rasulov
1281
Representations of a continuous group by unbounded operators
S. S. Sannikov
1285
A contribution to the theory of iteration processes
G. I. Chandirov
1289
A certain class of stochastic programming problems
D. B. Yudin
1292

CYBERNETICS AND THE REGULATION THEORY
Operating stability of complex systems
V. V. Kalashnikov
1294

PHYSICS
Critical state of a liquid, as investigated by means of gravitational waves
M. Sh. Giterman
1298
Perturbation theory for the expansion coefficients of two-electron wave function
A. M. Ermolaev
1302
Pair correlation in polycyclic molecules
V. Z. Kresin
1306
Features of critical current behaviour in wires of superconducting niobium-base alloys, as dependent on magnetic field and temperature
B. G. Lazarev, L. S. Lazareva, S. I. Goridov
1310
Relaxation of the spin of iron in the ferromagnetic compounds of $\mathrm{MnSb}$ and $\mathrm{CrTe}$ below the Curie point
S. S. Yakimov, V. Ya. Gamlitskii, V. I. Nikolaev, S. Rodin
1313

GEOPHYSICS
Phase transitions and critical phenomena taking place in the Earth's shell
M. V. Avdulov, V. K. Semenchenko
1316
Some results of magnetotelluric probing in the drift region of the North Pole-13 station
N. A. Deniskin, N. V. Lipskaya
1320
Equations of general circulation in the upper atmosphere
M. N. Izakov
1324
Estimate of the negative ion concentration in the $D$ region of the ionosphere
G. S. Ivanov-Kholodnyi
1328
Global gravity variations with time
È. È. Fotiadi, I. M. Pudovkin, G. E. Valueva
1330

CRYSTALLOGRAPHY
X-Ray diffraction study of double molybdate $\mathrm{KY(\mathrm{MoO}_4)}_2$
R. F. Klevtsova, S. V. Borisov
1333

Поправки к статье “Об оценках скорости сходимости некоторых проекционных методов решения эллиптических уравнений” (ДАН, т. 174, № 3, 1967 г.)
Yu. K. Dem'yanovich
Поправки к статье “К вопросу о равномерном приближении функций положительными линейными операторами” (ДАН, т. 172, № 4, 1967 г.)
M. I. Morozov
 
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