Mat. Zametki, 1991, Volume 50, Issue 1

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1991, Volume 50, Issue 1

	Real finite-gap solutions of the equation $\Delta u=\ch u$ M. V. Babich	3–9
	Solution of a problem of Mendeleev type and the estimation of the derivatives of polynomials in the Laguerre weighted space $L^2$ G. V. Badalyan, M. O. Edigaryan	10–18
	A relation between Fourier and Fejér sums O. D. Gabisoniya	19–33
	There does not exist an enumerable family of context-free grammars that generates the class of single-valued languages K. Yu. Gorbunov	34–40
	Approximative evaluation of the height of the maximal upper zero of a monotone Boolean function A. Yu. Kitaev	41–45
	On diameters of 2-regular graphs A. V. Knyazev	46–55
	Smoothing of Stanley–Reisner type singularities D. A. Mel'nikov	56–64
	A new approach to the theory of hypergeometric series and special functions of mathematical physics A. W. Niukkanen	65–73
	Absolute summability of Fourier series of functions in the classes $\operatorname{Lip}(\alpha,p)$ A. P. Pavlov	74–83
	Semantic admissibility criteria for deduction rules in $\mathbf{S4}$ and $\mathbf{Int}$ V. V. Rybakov	84–91
	Simplicial complexes and ruled varieties I. V. Savel'ev	92–97
	Prym's theta-function and hierarchies of nonlinear equations I. A. Taimanov	98–107
	Algebraic properties of certain cohomological invariants of equivariant mappings T. N. Fomenko	108–117
	Cartan extensions of stabilizers of exterior forms I. V. Chekalov	118–121
	Estimates of Gaussian sums I. E. Shparlinskii	122–130
	A priori estimates of solutions of the Sturm–Liouville equation and the A. M. Molchanov criterion L. A. Shuster	131–138

Brief Communications
	A minimax theorem O. Yu. Borenshtein, V. S. Shulman	139–141
	Basis property of a part of the system of eigenvectors of a holomorphic operator-function V. A. Grinshtein	142–144
	Diffusion approximation of star-shaped symmetric networks with losses M. Yu. Kradinov	144–146
	Estimates of norms of operators that are continuous in measure S. A. Pichugov	146–148
	Pointwise strong summability of multiple Fourier series V. A. Rodin	148–150
	Weak convergence to processes connected with stable distributions M. N. Sviridenko	150–153
	Approximation of differential polynomials on classes of vector functions O. A. Timoshin	153–155

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