Mat. Zametki, 1977, Volume 21, Issue 4

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1977, Volume 21, Issue 4

	Nonaxiomatizability of lattice-orderable rings A. A. Vinogradov	449–452
	A property of polarization A. A. Zaitsev	453–457
	Lattice isomorphisms of free semigroups A. Ya. Ovsyannikov	459–471
	The Riemann problem and expansion of entire functions of two variables with respect to quasiexponential bases G. D. Derevyanchenko, V. A. Kakichev	473–483
	An analog of the system of reference functions corresponding to the Walsh functions V. V. Lesin	485–493
	The norm in $C$ of orthogonal projections onto subspaces of polygonal functions P. Oswald	495–502
	The interpolation of $l^r$ sequences by $H^p$ functions S. V. Shvedenko	503–508
	Domains of fractional powers of ordinary differential operators in spaces $L_p$ I. D. Evzerov	509–518
	The membership of solutions of quasielliptic equations to space $L_p$ V. A. Kondrat'ev, S. D. Èidel'man	519–524
	Unique solvability of certain matrix partial differential equations S. A. Lomov	525–530
	The convergence to zero of Gaussian sequences V. V. Buldygin, V. S. Donchenko	531–538
	The operator of minimal continuance of linear functionals P. K. Belobrov	539–550
	Two theorems on boundary properties of minimal surfaces in nonparametric form V. M. Miklyukov	551–556
	Functor $D$ and strong homotopy V. A. Smirnov	557–564
	Minimal coverings and maximal packings of $(k-1)$-subsets by $k$-subsets N. N. Kuzyurin	565–571

Reports read at the International Conference on the Theory of Approximation of Functions held at Kaluga from July 24 to 28, 1975
	Summation of power series by regular methods V. A. Belyaev	573–580
	Relative rational approximation of the function $e^x$ G. Németkh	581–586
	Conditions for convergence of Fourier series in the $L$ metric G. A. Fomin	587–592

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