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1974, Volume 218, Number 3  


MATHEMATICS
On separable polynomials over commutative Banach algebras
E. A. Gorin, V. Ya. Lin
505
A generalized area theorem for a class of $q$-quasi-conformal mappings
V. Ya. Gutlyanskii, V. A. Shchepetev
509
Conjugate gradient methods that do not require the solution of one- dimensional minimization problems
Yu. M. Danilin
513
On conjugate functions of $n$ variables
L. V. Zhizhiashvili
517
On the divergence of Lagrange interpolation processes on sets of positive measure
Al. A. Privalov
519
Duality theorems for a problem with oblique derivative
È. M. Saak
521
Realization of some ultrametric spaces and the inverse problem for $\varepsilon$-entropy in $h_p$-spaces
A. F. Timan
525
On Bravais, Voronoi and Delone classifications of four-dimensional lattices
M. I. Shtogrin
528

CYBERNETICS AND THE REGULATION THEORY
Attainable accuracy of adaptation algorithms
Ya. Z. Tsypkin, B. T. Polyak
532

FLUID MECHANICS
Filtration of two liquids having different densities and viscosities during injection into a gallery at a constant rate
N. N. Verigin, V. S. Sargsyan
536

MATHEMATICAL PHYSICS
Invariants of a local Lorentz subgroup in the Einstein theory of gravitation
O. S. Ivanitskaya
540
Mathematical problems of reactor kinetics
Yu. A. Kuznetsov, S. F. Morozov
543
Coherent states for groups of motions of symmetric spaces
M. I. Monastyrskii, A. M. Perelomov
547

PHYSICS
$\mathrm{TR}^{3+}$ ion stimulated radiation in ytterbium-aluminium garnet crystals
Kh. S. Bagdasarov, A. A. Kaminskii, A. M. Kevorkov, A. M. Prokhorov, S. È. Sarkisov, T. A. Tevosyan
550
Induction of a new magnetic states in the alloy $\mathrm{Mn}_{0,97}\mathrm{Co}_{0,03}\mathrm{As}$ by a strong magnetic field
A. A. Galkin, È. A. Zavadskii, V. M. Smirnov, V. I. Val'kov
552

GEOPHYSICS
On the periodic winds of the stratosphere and lower mesosphere of tropical zone
G. I. Golyshev, L. S. Minyushina, A. Kh. Hrgian
570
On corpuscular nature of the polar thermosphere heating effects
S. M. Poloskov, G. F. Tulinov, M. L. Shanen
573

CRYSTALLOGRAPHY
Crystalline structure of sakhaite, $\mathrm{Ca}_3\mathrm{Mg}(\mathrm{BO}_3)_2\mathrm{CO}_3\cdot x\mathrm{H}_2\mathrm{O}$
A. V. Chichagov, M. A. Simonov, N. V. Belov
576

Поправки к статье “О сложности относительных вычислений” (ДАН, т. 214, № 5, 1974 г.)
M. I. Dekhtyar'
 
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