Mat. Zametki, 1976, Volume 20, Issue 5

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1976, Volume 20, Issue 5

	Structure of $p$-adic Schottky groups N. G. Chebotarev	625
	Convergence of Cesàro means of negative order of functions of bounded generalized second variation T. I. Akhobadze	631
	Cauchy-type $LG^*$ integral I. A. Vinogradova	645
	Best approximation by splines on classes of periodic functions in the metric of $L$ N. P. Korneichuk	655
	Tests for the convergence of continued fractions, based on the fundamental system of inequalities S. S. Khloponin	665
	Perturbations of the Schrödinger equation by potentials with small support I. D. Chueshov	675
	Conditions for the embedding of classes of sequences and their consequences I. V. Shragin	681
	Approximation of a linear system of second-order differential equations Yu. Ya. Belov	693
	Self-conjugacy of abstract differential operators of the hyperbolic type L. I. Vainerman	703
	Conditions for the self-adjointness of a quasi-elliptic operator M. G. Gimadislamov	709
	Regularity of boundary points for linear equations of parabolic type I. T. Mamedov	717
	Coercive estimates for a class of differential operators B. P. Paneyakh	725
	Extension of linear functionals in Banach spaces of measurable functions M. Sh. Braverman, G. Ya. Lozanovskii	733
	$R^{(\infty)}$ is diffeomorphic to $R^{(\infty)}\setminus\{0\}$ A. A. Lobuzov	741
	A certain approach to the problem of regularization on the basis of the perturbation of linear operators N. A. Sidorov, V. A. Trenogin	747
	Inversion of the oscillatory property of focusing operators Yu. V. Pokornyi, S. V. Smitskikh	753
	Axiomatic theory of convexity V. V. Tuz	761
	Contractibility of the diagonal of the product of a hyperelliptic curve with itself B. V. Martynov	771

Reports read at the International Conference on the Theory of Approximation of Functions held at Kaluga from July 24 to 28, 1975
	Approximation of a class of functions of several variables by certain polynomial operators L. I. Bausov, I. M. Petrov	775
	Theorems of Korovkin type A. D. Gadzhiev	781
	Exact constants in some converse theorems for approximations by trigonometric polynomials A. F. Timan, V. N. Trofimov	787

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