Izv. Vyssh. Uchebn. Zaved. Mat., 1990, Number 3

JOURNALS // Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika // Archive

1990, Number 3

	Some classes of submanifolds of codimension two in the pseudo-Euclidean space $E^{n+1}_{2(n+1)}$ S. Kh. Arutyunyan	3
	Some nonlocal boundary value problems for second-order model equations D. Bazarov	11
	A criterion for the unique solvability of the Cauchy problem for functional-differential equations B. M. Карелин	16
	Thickness of the spectrum of a singular string I. S. Kats	23
	Groups with infinite normal subgroups of infinite index A. V. Kraichuk	31
	Quasinormed spaces of rational approximation in the norm of BMO V. L. Kreptogorskii	38
	Multidimensional Carleman formulas in Siegel domain A. M. Kytmanov, T. N. Nikitina	44
	Cubature formulas with a minimal number of nodes for a centrally-symmetric $n$-dimensional integral G. G. Rasputin	50
	Line hypercomplexes in a Euclidean space and in non-Euclidean spaces B. A. Rozenfel'd, O. V. Zatsepina, P. G. Stegantseva	57

Brief communications
	A problem of the boundedness of a signed measure defined on the projectors of a von Neumann algebra of type I S. V. Dorofeev	67
	Existence and uniqueness of optimal weighted quadrature formulas of a certain form E. E. Dunaichuk	70
	Rational tetrahedra K. È. Kalyamanova	73
	Infinite groups, all of whose infinite $pd$-subgroups are normal F. N. Liman	75
	Absolute continuity of norms in Banach ideal spaces with shifts A. G. Myasnikov	78
	Spectral analysis of integral operators with a kernel that depends on the difference and the sum of arguments A. N. Pal'chikov	80
	Homotopy classes of curves in the flag plane O. A. Sdvizhkov	83
	Abelian torsion-free $CS$-groups A. R. Chekhlov	84

Mathematical Events in the USSR and abroad
	First All-Russia School on the foundations of mathematics and the theory of functions	88