Mat. Zametki, 1971, Volume 10, Issue 3

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1971, Volume 10, Issue 3

	Ivan Matveevich Vinogradov (foto)
	Ivan Matveevich Vinogradov (on his 80th birthday)		251
	A counterexample to the Hasse principle for a system of two quadratic forms in five variables V. A. Iskovskikh		253
	Lucas's criterion for the primality of numbers of the form $N=h2^n-1$ S. B. Stechkin		259
	Infinite-order differential equations with analytic solutions A. F. Leont'ev		269
	Hilbert's boundary-value problem (with coefficients from the Wiener ring) for matrix-valued functions analytic in the unit disk A. L. Lukov		279
	A geometric property of functions starlike of order $\alpha$ D. V. Prokhorov		287
	An example of a function which is Denjoy integrable but not Khinchin summable V. S. Shul'man		295
	Operators, absolutely indefinitely bounded below, in spaces with indefinite metric V. A. Senderov		301
	The existence of solutions of generalized differential equations A. F. Filippov		307
	Some continuous decompositions of the space $E^n$ Van Ny Kyong		315
	Isometric immersions of a Euclidean plane in Lobachevskii space Yu. A. Volkov, S. M. Vladimirova		327
	Nonrigidity of certain composite surfaces of revolution I. Ivanova-Karatopraklieva		333
	Exact projective representations of Abelian groups L. F. Barannik		345
	An optimal problem in graph theory M. A. Dukhovnyi		355
	Generalization of the problem of the number of partitions of a finite set B. I. Selivanov		361