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Studies in geometry ``in general'' and mathematical analysis

	Aleksandr Danilovich Aleksandrov (photo)
	On the 75th birthday of Academician A. D. Aleksandrov V. A. Zalgaller, O. A. Ladyzhenskaya, Yu. G. Reshetnyak		3
	A theorem on the congruence of the angles of a triangle for a class of Riemannian manifolds S. A. Akbarov, V. A. Toponogov		16
	Closed curves that are trigonometric polynomials in the arc length Yu. A. Aminov		25
	Traces of functions in generalized Sobolev spaces with a mixed norm on an arbitrary coordinate subspace. II M. Z. Berkolaiko		34
	On a quadrangle of spectral sequences V. V. Vershinin, V. G. Gorbunov		41
	A variant of the bifurcation of a fourfold equilibrium state with two zero eigenvalues E. P. Volokitin, S. A. Treskov		60
	Structures that can be generated by sets of morphisms V. K. Ionin		66
	Linear operators in lattice-normed spaces A. G. Kusraev		84
	Infinitesimals and the calculus of tangents S. S. Kutateladze		123
	Almost regular polyhedra A. D. Milka		136
	Closed convex hypersurfaces with given conditional curvature A. V. Pogorelov		142
	Classes of differential forms that are invariant under quasiconformal mappings M. V. Talalaev		149
	“Almost” cone-preserving mappings A. V. Shaidenko		151
	Closed convex surfaces in a pseudo-Euclidean space W. G. Gaydalovich, U. Il'khamov, D. D. Sokoloff		154
	Uniformly summable semigroups of operators. II. Perturbation of semigroups V. V. Ivanov		159
	Conformally flat metrics of bounded curvature on an $n$-dimensional sphere V. V. Slavskii		183