Izv. Akad. Nauk SSSR Ser. Mat., 1986, Volume 50, Issue 3

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1986, Volume 50, Issue 3

	A theorem on splitting an operator, and some related questions in the analytic theory of perturbations A. G. Baskakov		435
	Vector rank of commuting matrix differential operators. Proof of S. P. Novikov's criterion P. G. Grinevich		458
	On a problem of Szép L. S. Kazarin		479
	Analogues of the objects of Lie group theory for nonlinear Poisson brackets M. V. Karasev		508
	Inductive and projective topologies. Sufficient sets and representing systems Yu. F. Korobeinik		539
	Homotopy formulas for the $\overline\partial$-operator on $\mathbf CP^n$ and the Radon–Penrose transform P. L. Polyakov, G. M. Henkin		566
	Decidability of admissibility in the modal system $\mathrm{Grz}$ and in intuitionistic logic V. V. Rybakov		598
	On an almost periodic perturbation on an infinite-dimensional torus D. A. Tarkhov		617