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1973, Volume 208, Number 6  


MATHEMATICS
The central limit theorem in “noncommutative” probability theory
V. V. Anshelevich
1265
On boundary-value problems for a first-order differential equation with operator coefficients and the expansion in eigenfunctions of this equation
V. I. Gorbachuk, M. L. Gorbachuk
1268
Comparison of differential operators, and differential operators of constant strength
G. G. Kazaryan
1272
Models of exceptional Lie algebras
I. L. Kantor
1276
On several new fixed point principles
M. A. Krasnosel'skii
1280
Approximation of differentiable functions of several variables by Fourier sums in the $L_p$ metric
N. S. Nikol'skaya
1282
Nonlocal extendibility of solutions of vibrostable differential equations
A. V. Pokrovskii
1286
Variational principles for the spectrum of nonselfadjoint operators
P. V. Popov
1290
Interpolation in $H^p$ spaces over a half-plane
A. M. Sedletskii
1293
On a question concerning the stability of the solution of the Dirichlet problem for the equation $\operatorname{div}\{k(x)\operatorname{grad}u\}-q(x)u=-f(x)$
P. K. Senatorov
1296
On the growth of meromorphic functions admitting a special estimate from below
E. N. Sergienko
1298
On a boundary-value problem for a degenerate parabolic equation
S. A. Tersenov
1300
Complete homogeneous ultrametric spaces
V. Z. Feinberg
1303

CYBERNETICS AND THE REGULATION THEORY
On the construction of generators of correct information
I. V. Velbitskii
1307
Switching functions
V. S. Chunaev
1311

ASTRONOMY
Morphology of the structure of Lunar matter metallic fragment
R. I. Mints, T. M. Petukhova
1315

PHYSICS
Concentration dependence of generation parameters of $\mathrm{CaF}_2:\mathrm{Dy}^{2+}$ crystal laser
M. I. Dzhibladze, T. M. Murina
1318
Isometries of Pfaff's space – time systems
R. F. Polishchuk
1321
On the number of bound electron at impurity atom nucleus in dilute metallic interstitial solid solution
G. S. Solov'ev
1325

GEOPHYSICS
On the motion of air masses in lower thermosphere near the equator
P. B. Babadzhanov, B. V. Kal'chenko, B. L. Kashcheev, V. V. Fedynskii
1334
The dependence of mid ocean ridges on the rate of lithospheric plate divergence
O. G. Sorokbtin
1338
On caldera explosive formation
H. S. Shteinberg
1342

CRYSTALLOGRAPHY
Crystalline structure of $\mathrm{Li}(\mathrm{Fe},\mathrm{Zn})[\mathrm{PO}_4]$
Yu. K. Kabalov, M. A. Simonov, V. I. Ivanov, O. K. Melnikov, N. V. Belov
1346

Поправки к статье “О плоских ортогональных преобразованиях” (ДАН, т. 206, № 5, 1972)
A. A. Bogush, F. I. Fedorov

LETTER TO THE EDITORIAL
Поправки к статье “Линейные функции Ляпунова для уравнений с положительными решениями и среднеквадратичная устойчивость” (ДАН, т. 204, 1972 г.)
G. N. Mil'shtein
 
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