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1988, Volume 298, Number 3  


MATHEMATICS
Lebesgue extension of a positive operator
G. P. Akilov, E. V. Kolesnikov, A. G. Kusraev
521
Weight elements of Chevalley groups
N. A. Vavilov
524
Cohomology of supermanifolds, and integral geometry
Th. Th. Voronov, A. V. Zorich
528
A spline-approximation method for solving some ill-posed problems
A. I. Grebennikov
533
Sectorial extensions of a positive operator, and the characteristic function
V. A. Derkach, M. M. Malamud, È. R. Tsekanovskii
537
An initial-boundary value problem for the system $a(x)u_{tt}=a(x)\mathrm{grad} \mathrm{div}a(x)u+\mathrm{rot} \mathrm{rot}u+b(x)u$
A. Dzhuraev
541
Multicriteria problems on graph spanning trees
V. A. Emelichev, V. A. Perepelitsa
544
The group $SK_2$ for quaternion algebras
A. S. Merkurjev
548
Closed convex projectively minimal hypersurfaces
A. V. Pogorelov
551
On compacta lying in an $n$-dimensional universal Menger compactum and having homeomorphic complements in it
A. Ch. Chigogidze
552
On an entropic method for obtaining lower bounds on the complexity of Boolean functions
S. P. Yukna
556

CYBERNETICS AND THE REGULATION THEORY
Determination of the structure of spacial-temporal data with the help of dynamic segmentation
A. M. Taratorin, A. G. Kogan
560

MECHANICS
Continuous theory of composite-material fracture under end-face crushing
A. N. Guz
565
Spectral characteristics of the vibration of milling spindle body with elastically installed rotor
A. S. Kel'zon, V. V. Genkin, A. P. Zobnin
570

FLUID MECHANICS
On the maximal drag of a curvilinear obstacle subjected to the action of free jets with separation
D. V. Maklakov
574

GEOPHYSICS
On the observation of seismic wave velocity variations with the purpose of forecasting and the destruction of geophysical medium
A. A. Berdyev, V. A. Mukhamedov
578
On the uniqueness of the solution of inverse problems of hydrolocation by the side-viewing method
V. I. Dobrinskii, A. M. Lisin
581

MATHEMATICAL PHYSICS
The reconstruction of the interaction potential from scattering data by means of nonlinear equations
D. I. Abramov
585
On the accuracy of the reconstruction of a piecewise-continuous velocity function of a medium from an approximately given vertical hodograph
Yu. L. Gaponenko, I. V. Nikolaev
589
Bifurcations of strange attractors. The connection of Lyapunov characteristic exponents with the spectrum
Yu. V. Gulyaev, A. S. Dmitriev, V. Ya. Kislov, A. I. Panas
593
Elliptic solutions of the stationary Euler equations
O. V. Kaptsov
597

PHYSICS
Possibility of the coherent suppression of spontaneous transitions in a quantum physical object
V. L. Berdinsky
601
Raman scattering in crystallized and molten calcium-niobium-gallium garnet
Yu. K. Voronko, A. B. Kudryavtsev, N. A. Es'kov, V. V. Osiko, A. A. Sobol, E. V. Sorokin, F. M. Spiridonov
604
A shock wave in dispersive hydrodynamics
A. V. Gurevich, A. L. Krylov
608
On a criterion of electrical destruction of the dielectrics in highly non uniform fields
V. Z. Parton, B. A. Kudryavtsev, N. A. Senik
611
 
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