Mat. Zametki, 1987, Volume 42, Issue 4

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1987, Volume 42, Issue 4

	Aleksei Fedorovich Leont'ev
	Aleksei Fedorovich Leont'ev A. G. Vitushkin, A. A. Gonchar, E. P. Dolzhenko, V. V. Napalkov, A. M. Sedletskii, S. B. Stechkin, Yu. N. Frolov		483
	Number of different prime divisors of recurrence sequences I. E. Shparlinski		494
	Invertibility of the group ring of a right-ordered group over a skew field N. I. Dubrovin		508
	Jung constant in $l_1^n$ V. L. Dol'nikov		519
	Well-posedness of a mixed problem for some classes of equations well-posed in the petrovskii sense M. K. Balaev, S. Ya. Yakubov		527
	Sufficient conditions for the concavity of the solution of the dirichlet problem for the equation $\Delta u=-1$ A. A. Kosmodem'yanskii (Jr.)		537
	Solution of a system of linear equations over a commutative ring G. I. Malashonok		543
	Weighted inequality of hardy type for elliptic operators V. Z. Meshkov		549
	Test for minimality of lagrangian submanifolds in Kдhlerian ones Lê Hông Vân, A. T. Fomenko		559
	Hypermaps of continua I. E. Prokhorova		572
	Theorem on continuous extension of a multivalued function and its applications A. A. Tolstonogov		581
	Compact factor spaces of topological groups and haydon spectra V. V. Uspenskii		594
	Depth and polynomial equivalence of formulas for closed classes of two-valued logic A. B. Ugol'nikov		603
	Approximation of the roots of matrix equations by power series O. V. Matveev		613