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We consider the problem important for the condensed matter physics,superconductivity physics, and electrodynamics of continuous media - theproblem of the matter dielectric permittivity possible values spectrumdefinition. Two ways of the dielectric permittivity values spectrumidentification are analyzed. The proposed technique allows the author tocomplete the universal criterion of stability identified by D. A. Kirzhnits fora system of charged particles by the criterion of stability for asuperconducting system of charged particles.

To the identification of universal criterion of the charged particles system stability