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The realization of idea of time-scale invariance for relaxation processes inliquids has been performed by the memory functions formalism. The bestagreement with experimental data for the dynamic structure factor $S(k,\omega)$of liquid cesium near melting point in the range of wave vectors ($0.4\ang^{-1} \leq k \leq 2.55 \ang^{-1}$) is found with the assumption ofconcurrence of relaxation scales for memory functions of third and fourthorders. Spatial dispersion of the four first points in spectrum of statisticalparameter of non-Markovity $ \epsilon_{i}(k,\omega)$ at $i=1,2,3,4$ has allowedto reveal the non-Markov nature of collective excitations in liquid cesium,connected with long-range memory effect.Comment: REVTEX +3 ps figure

Time-scale invariance of relaxation processes of density fluctuation in slow neutron scattering in liquid cesium