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 Theorems on the complete set of isomorphisms in the $L_2$-theory of generalized solutions of boundary value problems for a Petrovskii parabolic equationN. V. Zhitarashu 451 Asymptotic expansion of the state density and the spectral function of a Hill operatorD. Schenk, M. A. Shubin 474 Sharp order estimates for best rational approximations in classes of functions representable as convolutionsV. N. Rusak 492 On the microlocal structure of pseudodifferential operatorsV. V. Lychagin, B. Yu. Sternin 516 Sharp error estimates of some two-level methods of solving the three-dimensional heat equationA. A. Zlotnik, I. D. Turetaev 530 On a measure of the algebraic independence of the values of certain functionsYu. V. Nesterenko 545