Mat. Zametki, 1991, Volume 50, Issue 4

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1991, Volume 50, Issue 4

	Some applications of the theory of operators in Krein spaces to the solvability of nonlinear Hamiltonian systems T. Ya. Azizov, V. L. Khatskevich	3–9
	Properties of quadratic maps in a Banach space A. V. Arutyunov	10–20
	Partial sums of a trigonometric series with convex coefficients A. S. Belov	21–27
	The Helly intersection theorem N. A. Bobylev	28–32
	Structure of the adèle group of a product of algebraic groups A. A. Bondarenko	33–37
	Stabilization of energy for a wave equation with memory V. V. Varlamov	38–46
	Behavior of the sum of a Dirichlet series having a prescribed growth A. M. Gaisin	47–56
	Approximation of a subharmonic function of infinite order by the logarithm of the modulus of an entire function M. A. Hirnyk	57–60
	The semilattice of computable families of recursively enumerable sets A. N. Degtev	61–66
	Automatic continuity of operators in vector lattices A. V. Koldunov	67–74
	Integral equations for the problem of stationary waves produced by a floating body N. G. Kuznetsov	75–83
	Viable parametrization of continuous many-valued mappings M. S. Nikol'skii	84–87
	Geometry of the spectrum of the one-dimensional Schrödinger equation with a periodic complex-valued potential L. A. Pastur, V. A. Tkachenko	88–95
	Extreme subsets of operator intervals È. L. Pekarev	96–101
	Number of small solutions of a homogeneous linear congruence I. A. Semaev	102–107
	Symmetric representations of algebras with involution V. V. Sergeichuk	108–113
	Improvement of an inequality of Hardy containing an estimate of the size of an intermediate derivative of a function L. V. Taikov	114–122
	Preservation of invariant manifolds of Hamiltonian systems in the presence of a perturbation D. V. Treschev	123–131
	Analytic solutions of the functional equation $(xy)x=x(yx)$ A. M. Shelekhov	132–140
	Minimum principle for bounded holomorphic functions in many-dimensional domains G. Schmalz	141–149

Brief Communications
	Smoothness and limiting properties of solutions of a second-order parabolic equation Yu. A. Alkhutov	150–152
	Nonisomorphic full automorphism groups of nonseparable measure spaces V. V. Ryzhikov	152–154
	Behavior of nearly homothetic mappings T. V. Sokolova	154–156

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