Sibirsk. Mat. Zh., 1990, Volume 31, Number 1

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1990, Volume 31, Number 1

	Strengthening the group topology of a countable group up to a general group V. I. Arnautov, E. I. Kabanova		3
	Mappings of pseudo-Euclidean spaces that preserve the isotropic property of the vectors S. N. Astrakov		14
	Decidability of elementary theories of lattices of subsemigroups B. Bayasgalan		27
	Stability investigation for a certain explicit difference scheme A. M. Blokhin, R. D. Alaev		34
	A multiple integral and a multiple Fourier series when the summation is by squares I. L. Bloshanskii		39
	Domains of attraction for mixing sequences A. G. Grin'		53
	Denseness properties of the lattice of separation-degrees S. G. Dvornikov, T. V. Rybina		64
	The index of families of convolution operators on abelian groups V. M. Deundyak		70
	A problem of the connection of fundamental families of solutions for a system of linear differential equations with polynomial coefficients M. A. Kovalevsky		79
	Approximation of analytic functions and of Teichmüller spaces S. L. Krushkal', V. D. Golovan		96
	Definable invariants of bilinear mappings A. G. Myasnikov		104
	Summability by the Abel method of generalized multiple Fourier series A. Yu. Petrovich		116
	Varieties with a simple countable skeleton of embeddability A. G. Pinus		127
	Asymptotics of infinitely divisible distributions on $\mathbf{R}$ M. S. Sgibnev		135
	Contractive operators and Khinchin's inequality E. M. Semenov, I. Ya. Shneiberg		141
	Encoding of pseudoboolean models for infinitary nonclassical logic of transfinite order A. Tauts		150
	Growth and distribution of zeros of holomorphic mappings of a finite-dimensional space into a Banach space S. Yu. Favorov		161
	Optimal control of a plate over an obstacle A. M. Khludnev		172
	$K$-capacity and the Rado problem for mappings with bounded distortion V. A. Shlyk		179
	Invariance principle for the sum of random variables defined on a homogeneous Markov chain N. V. Gizbrekht		187
	Systems of generators of subgroups of $\mathrm{PSL}(2,\mathbf{C})$ N. A. Isachenko		191
	Sequential order topologies S. A. Malyugin		194
	On the generalized homotopy property Nguyen Le Anh		198
	Some extremal problems in the theory of quasiconformal mappings V. I. Semenov, S. I. Sheenko		202
	On the problem of envelopes of locally convex spaces E. V. Tokarev		205
	Criteria for the nontriviality of infinite-order Sobolev–Orlicz classes and spaces in a complete Euclidean space Ha Huy Bang		208
	Spaces that are close to $\mathbf{R}^n$ V. A. Chatyrko		214
	Generalization of Chebyshev polynomials I. E. Shparlinski		217