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1975, Volume 221, Number 5  

MATHEMATICS
The method of hyperspheres for solving discrete programming problems
D. A. Babaev 		1009–1012
On the Schoenflies–Bieberbach theorem
È. B. Vinberg 		1013–1015
Numerical methods in nonlinear programming
Yu. G. Evtushenko 		1016–1019
Distinguishing hammocks in a directed graph
V. N. Kas'yanov 		1020–1022
Some subspace distribution theorems and their application to the study of linear operators
S. P. Kovalenko 		1023–1026
On branch points of optical hypersurfaces
M. M. Lavrent'ev, V. R. Kireitov 		1027–1030
On conditions for a local minimum in extremal problems with constraints
E. S. Levitin 		1031–1034
On the resolvent of a degenerate operator in Banach space
V. P. Orlov, P. E. Sobolevskii 		1035–1037
On the Tannaka–Artin problem
V. P. Platonov 		1038–1041
On time-optimal problems
Yu. F. Pronozin 		1042–1045
On the solvability of infinite-dimensional selfadjoint elliptic equations
M. N. Feller 		1046–1049
On the coincidence of the indices of the Dirichlet and Neumann problems for elliptic systems
V. I. Shevchenko 		1050–1052
On coercive difference approximations of a problem with oblique derivative
L. Ya. Shlyapochnik 		1053–1055
The commutator subgroups of simple algebras with surjective reduced norms
V. I. Yanchevskii 		1056–1058

FLUID MECHANICS
Experimental study of spherical Couette flow
I. M. Yavorskaya, Yu. N. Belyaev, A. A. Monakhov 		1059–1062

MATHEMATICAL PHYSICS
The first approximation of the “temperature” expansion of the Bogoljubov “chain”
I. I. Ol'khovskii 		1063–1065

PHYSICS
Structural effects in the spin reorientation of erbium orthoferrite
A. S. Bulatov, V. A. Finkel 		1066–1068
Elastic waves in solid half-space with a magnetic field
I. A. Viktorov 		1069–1072

GEOPHYSICS
Application of the polarization effect for the purposes of remote detection of oil films on the sea surface
A. A. Buznikov, G. A. Ivanyan, K. Ya. Kondrat'ev, D. V. Pozdnyakov 		1082–1085
Quasi-periodic drift of energetic proton clouds around the Earth according to the data of geomagnetic pulsations of the $Ipdp$ type
A. V. Guglielmi, N. A. Zolotukhina 		1086–1088
 
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