Izv. Akad. Nauk SSSR Ser. Mat., 1987, Volume 51, Issue 4

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1987, Volume 51, Issue 4

	Galois moduli of period $p$ group schemes over a ring of Witt vectors V. A. Abrashkin		691
	Some constructions of integrable dynamical systems O. I. Bogoyavlenskii		737
	The Wiener–Hopf equation in Nevanlinna and Smirnov algebras V. S. Vladimirov		767
	On the spectral theory of multiparameter difference equations of second order G. Sh. Guseinov		785
	Quadratic conditions for a Pontryagin minimum in an optimal control problem linear in the control. II. Theorems on weakening equality constraints A. V. Dmitruk		812
	On representations of an algebra of pseudodifferential operators with multidimensional discontinuities in the symbols B. A. Plamenevskii, V. N. Senichkin		833
	The distribution of numbers representable as a sum of two squares V. A. Plaksin		860
	The method of isomonodromy deformations and connection formulas for the second Painlevé transcendent A. R. Its, A. A. Kapaev		878
	Application of the group algebra of the problem of the tail $\sigma$-algebra of a random walk on a group and the problem of ergodicity of a skew-product action R. S. Ismagilov		893