
Pairs of integers which can be written as the sum of two squares V. A. Plaksin

145 

Number of solutions of the equation $x^s=e$ in the symmetric group L. M. Volynets

155 

Trigonometric diameters of the Sobolev classes $W^r_p$ in the space $L_p$ V. E. Maiorov

161 

Relations between certain classes of sets in Banach spaces I. G. Tsar'kov

174 

Completeness of the eigenfunctions of irregular differential operators in a space of vectorvalued functions A. I. Vahabov

197 

Typical property of Lyapunov exponents V. M. Millionshchikov

203 

Uniqueness and stability of extension of solution of an elliptic equation from a set to a domain N. S. Nadirashvili

218 

Estimates for the trace of the averaged matrix V. V. Zhikov

226 

Locally compact groups in which all nonidentity closed subgroups are open P. I. Kirku

238 

A combinatorial approach to the problem of solvability of the threeindex transportation problem V. D. Matveenko

243 

Normal approximation for calculating the rate of convergence in the weak law of large numbers L. V. Rozovskii

252 

Best approximation of unbounded by bounded operators, and allied problems V. V. Arestov

269 