Sibirsk. Mat. Zh., 1980, Volume 21, Number 4

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1980, Volume 21, Number 4

	Kleinian groups, Teichmüller space and Mostow's rigidity theorem B. N. Apanasov	3
	The convergence rate in continuity theorems for systems with an infinite number of servers I. Akhmarov	16
	Determination of the coefficient $q$ in the equation $u_t-\Delta u+qu=F$ (the case of the first boundary value problem in the half-space) N. Ya. Beznoshchenko	22
	Structure of an integral group ring with trivial elements of finite order A. A. Bovdi	28
	Chronogeometry of Gödel and de Sitter manifolds A. K. Guts	38
	Representation of a group of conformal motions of Euclidean space and Legendre functions on the cut O. A. Dubovik	45
	Theorem on extension of bounded solutions for differential equations and the averaging principle P. P. Zabreiko, O. M. Petrova	50
	Wave fronts of solutions of boundary value problems for a class of symmetric hyperbolic systems V. Ya. Ivrii	62
	Theorems of Giraud type for second-order parabolic equations admitting of degeneration L. I. Kamynin, B. N. Khimchenko	72
	Fundamental solutions of homogeneous $B$-hyperbolic equations I. A. Kipriyanov, L. A. Ivanov	95
	Maximal nowhere dense sets A. V. Koldunov	103
	The reduction method for integro-differential equations G. A. Leonov, V. B. Smirnova	112
	Some properties of permutations of functions E. A. Pavlov	125
	On the problem of the basis of a free alternative $\Phi$-algebra N. S. Prokhanov	130
	Turnpike sets in discrete dispersed dynamical systems A. M. Rubinov	136
	Formulation of boundary value problems for an equation of mixed type with degeneration of the second kind on the boundary of an infinite domain K. B. Sabitov	146
	Critical sets in optimization problems with several constraints S. G. Suvorov	151
	Selection of the regularization parameter in the solution of ill-posed problems V. P. Tanana, V. A. Korshunov	161
	Zero divisors in binary Lie algebras V. T. Filippov	169
	Inequalities for degenerate hyperbolic operators N. A. Lar'kin	175
	More on approximation of periodic functions of the classes $SH^r_p*$ by Fourier sums N. S. Nikol'skaya	180
	Regularity of growth of algebroid solutions of algebraic differential equations V. P. Petrenko	194
	Identity of an algebra of triangular matrices S. V. Polin	206
	On the question of the normability of Boolean algebras with a continuous outer measure A. G. Poroshkin	216
	Rectification of circles A. G. Khovanskii	221

Abstracts of the Articles Submitted to VINITI
	Аннотации статей, депонированных в ВИНИТИ	227

Letters to the editor
	Letter to the editors: “On the Ljusternik–Shnirel'man theory” [Sibirsk. Mat. Z. 19 (1978), no. 3, 670–684] S. G. Suvorov	234