References
- P.S. Aleksandrov, Vvedenie V Teoriyu Mnozhestv I Obshchuyu Topologiyu (Introduction to Set Theory and General Topology), Nauka, Moscow, 1977, 368 p.
- P.S. Alexandroff, Sur le puissance des ensembles (B), C. R. Acad. Sci. 162 (1916), pp. 323–325.
- E.A. Barabanov and A.S. Voidelevich, Remark on the theory of Sergeev frequencies of zeros, signs, and roots for solutions of linear differential equations. I, Differ. Equ. 52(10) (2016), pp. 1249–1267.
- E.A. Barabanov and A.S. Voidelevich, Remark on the theory of Sergeev frequencies of zeros, signs, and roots for solutions of linear differential equations. II, Differ. Equ. 52(12) (2016), pp. 1523–1538.
- V.V. Bykov, On Baire classification of Sergeev frequencies of zeros and roots of solutions of linear differential equations, Differ. Equ. 52(4) (2016), pp. 413–420.
- S. Elaydi, An Introduction to Difference Equations, Springer-Verlag, New York, 2005.
- A.Yu. Goritskii and T.N. Fisenko, Characteristic frequencies of zeros of a sum of two harmonic oscillations, Differ. Equ. 58(4) (2012), pp. 486–493.
- F. Hausdorff, Set Theory, Chelsea Publishing Company, New York, 1962, 352 p.
- N. Lusin, Sur la classification de M. Baire, C. R. Acad. Sci. 164 (1917), pp. 91–94.
- I.N. Sergeev, Definition of characteristic frequencies of a linear equation, Differ. Equ. 40(11) (2004), pp. 1657–1658.
- I.N. Sergeev, Definition and properties of characteristic frequencies of a linear equation, J. Math. Sci. 135(1) (2006), pp. 2764–2793.
- I.N. Sergeev, Oscillation and wandering of solutions to a second order differential equation, Moscow Univ. Math. Bull. 66(6) (2011), pp. 250–254.
- I.N. Sergeev, Oscillation and wandering characteristics of solutions of a linear differential systems, Izv. Math. 16(1) (2012), pp. 139–162.
- I.N. Sergeev, The remarkable agreement between the oscillation and wandering characteristics of solutions of differential system, Sb. Math. 204(1) (2013), pp. 114–132.
- I.N. Sergeev, Properties of characteristic frequencies of linear equations of arbitrary order, J. Math. Sci. 197(3) (2014), pp. 410–426.
- I.N. Sergeev, Turnability characteristics of solutions of differential systems, Differ. Equ. 50(10) (2014), pp. 1342–1351.
- I.N. Sergeev, The complete set of relations between the oscillation, rotation and wandering indicators of solutions of differential systems, Izv. Inst. Mat. Inform. 2(46) (2015), pp. 171–183.
- I.N. Sergeev, Oscillation, rotation, and wandering exponents of solutions of differential systems, Math. Notes 99(5) (2016), pp. 729–746.
- M.V. Smolentsev, Example of a third-order periodic differential equation whose frequency spectrum contains a closed interval, Differ. Equ. 50(10) (2014), pp. 1408–1412.
- M.V. Smolentsev, The existence of a linear third-order equation with a countable frequency spectrum, J. Math. Sci. 210 (2015), pp. 264–269.
- M. Souslin, Sur une définition des ensembles mesurables B sans nombres transfinis, C. R. Acad. Sci. 164 (1917), pp. 88–90.
- S.M. Srivastava, A Course on Borel Sets, Springer-Verlag, New York, 1998.