Izv. Vyssh. Uchebn. Zaved. Mat., 1991, Number 3

JOURNALS // Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika // Archive

1991, Number 3

	On functions that are weakly $p$-valent in the mean Yu. E. Alenitsyn	3
	Finite groups in which the lattice of centralizers is a sublattice of the lattice of subgroups V. A. Antonov	5
	On an interpretation of a theorem of Lukács Z. S. Grinshpun	14
	On the best approximation of points by planes A. E. Kolosov	17
	The implicit mapping theorem for a class of topological modules G. I. Kurapin	20
	On a condition for the linear regularity of second-order random fields N. A. Maslyukova	25
	Infinite-dimensional analogues, for a Hilbert space, of some classical theorems of Borsuk É. A. Mirzakhanyan	29
	Summation of Fourier expansions in systems of polynomial form A. D. Nakhman	35
	Unique solvability of a class of hybrid systems V. P. Rudakov	47
	The geometry of the solutions of a third-order partial differential equation A. K. Rybnikov	49
	Morphisms of $G$-spaces that determine invariant framings and connections V. V. Suvorov	54
	Solvability of a periodic problem for a nonlinear Hamiltonian system V. L. Khatskevich	61
	Simultaneous approximation of numbers connected with elliptic functions Ya. M. Kholyavka	70
	Critical theories of free nilpotent rings of certain types Yu. M. Vazhenin, V. Yu. Popov	74

Brief communications
	Quasi-orders on some inverse semigroups V. D. Derech	76
	A boundary value problem of N. P. Vekua with a piecewise-smooth shift Z. M. Lysenko	78
	Weighted spaces of analytic functions and systems of differential equations M. M. Mannanov	81
	Residues of the generalized function $\|\det x\|^\lambda\operatorname{sgn}^\nu(\det x)$ E. E. Petrov	83
	Solution of operator equations by the Vietoris iteration method Н. А. Strelkova	86