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 Geometry of the Grassmann image of a local isometric immersion of Lobachevskii $n$-dimensional isometric immersion of Lobachevskii $n$-dimensionalYu. A. Aminov 3 Spherical partial sums of the double Fourier series of functions of bounded generalized variationM. I. Dyachenko 29 On the connection generated by the problem of minimizing a multiple integralM. I. Zelikin 59 The image in $H^2(Q^3;\mathbb R)$ of the set of presymplectic forms with a prescribed kernelB. S. Kruglikov 73 An approximation scheme for measure-valued solutions of a first-order quasilinear equationE. Yu. Panov 83 On a class of elliptic potentials of the Dirac operatorA. O. Smirnov 109 Non-selfadjoint singular perturbations and spectral properties of the Orr–Sommerfeld boundary-value problemS. A. Stepin 129 Universally optimal waveletsN. A. Strelkov 147