Volume 25, Issue 3, May–June, 1973
In this issue (23 articles)

OriginalPaper
Best quadrature formulas for a class of differentiable periodic functions
T. N. Busarova Pages 227235 
OriginalPaper
Towards a theory of twodimensional integral equations with partial integrals
V. A. Kakichev, N. V. Kovalenko Pages 236245 
OriginalPaper
BoseEinstein and FermiDirac systems and reduced density matrices with nonzero boundary conditions
K. S. Matviichuk Pages 246254 
Brief Communications
Convex approximation of a controlled process and a method of synthesizing generalized optimal regimes
I. V. Beiko, M. F. Beiko Pages 274276 
Brief Communications
Uniqueness of the solution of a nonlinear problem
V. A. Bogatyrev Pages 277281 
Brief Communications
On ndimensional commutative formal groups over the ring of integers of a field ofpadic numbers
N. M. Glazunov Pages 282284 
Brief Communications
On the stability of the solutions of second order differential equations with periodic coefficients
F. M. Dannan Pages 285291 
Brief Communications
Application of the method of averaging to investigate essentially nonlinear systems excited by instantaneous forces
B. I. Dzyra Pages 292297 
Brief Communications
Approximation of functions of two variables by positive linear operators in the L_{p} metric
Z. V. Zaritskaya Pages 298302 
Brief Communications
Theorems on isomorphisms for elliptic systems with boundary conditions which are not normal
I. A. Kovalenko Pages 303307 
Brief Communications
Example of a locally commutative operator field
V. D. Koshmanenko Pages 308310 
Brief Communications
The integration of a nonlinear mixed boundary value problem in partial derivatives
V. L. Kul'chitskii Pages 311314 
Brief Communications
On operator and integral inequalities
N. S. Kurpel', B. A. Shuvar Pages 315318 
Brief Communications
Solution and stability of a system of two linear homogeneous first order differential equations with variable coefficients
G. A. Los' Pages 319327 
Brief Communications
The distribution of certain functionals of processes with semiindependent increments
T. I. Nasirova, A. V. Skorokhod Pages 328333 
Brief Communications
Boundary value problems for a multiplicatively generated quasidifferential operator
V. Ya. Sikiryavyi Pages 334337
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