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 Sharp constants for rational approximations of analytic functionsA. I. Aptekarev 3 $k$-Regular maps into Euclidean spaces and the Borsuk–Boltyanskii problemS. A. Bogatyi 73 Borsuk–Ulam theorem in infinite-dimensional Banach spacesB. D. Gel'man 83 Impact of quadratic non-linearity on the dynamics of periodic solutions of a wave equationA. Yu. Kolesov, N. Kh. Rozov 93 $D_\infty$-differential $A_\infty$-algebras and spectral sequencesS. V. Lapin 119 Righteous isometries of weakly symmetric spacesO. S. Yakimova 143