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**Sample text**

The mean energy of particle pair interaction in physical system. 50) but less straightforwardly than the one-particle statistical distribution function. Below we introduce a microscopically equivalent but more convenient N -particle distribution function F (N ) : F (N ) (r 1 , p1 ; . . rN , pN ; t) 1 δ[r1 −r 1 (t)]δ[p1 −p1 (t)] . . δ[r N −rN (t)]δ[pN −pN (t)]. = N1 ! . Na ! . 55) Here the summation includes all transpositions of identical particles, and the number of vectors (r, p) is equal to the total number of particles N = a Na in the system where a denotes sort of the plasma particles.

The ﬁrst of Eqs. 123) expresses the Fourier law of heat conductivity. 69) and relation between the electric current density and component velocities j = eni (u(i) − u(e) ), we obtain the energy balance equation: ∂uα ∂uβ 2 + − (∇ · u)δαβ ∂xβ ∂xα 3 ∂(ρ ) +∇ · (ρwu)−u · ∇P =∇ · (χ∇T )+ρν ∂t ∂uα j 2 + . 125) Let us reformulate now the previous equation in terms of speciﬁc entropy s (per the mass unit). 126) we obtain dP = ρdw − ρT ds, ∇P = ρ∇w − ρT ∇s, ∂s P ∂ =T − 2 ∇ · ρu ∂t ∂t ρ and ﬁnd ∂(ρ ) ∂ P + ∇ · (ρwu) − u · ∇P = ρ + ∇ · ρu + ρT u · ∇s ∂t ∂t ρ = ρT ∂s + u · ∇s ∂t ∂(ρs) + ∇ · (ρsu) .

D 3 rN d 3 pN . 57) The statistical distribution function D satisﬁes the continuity equation in the 6N -dimensional phase space of the entire system, and it takes into account all possible correlations among particles and ﬁelds. For many problems, however, it is suﬃcient to use a simpler and less detailed representation of the system, which is achieved by introducing the one-particle distribution function (1) fa (r 1 , p1 , t) = Na D(r 1 , p1 ; . . rN , pN ; t)d 3 r2 d 3 p2 . . 58) the two-particle distribution function (2) fa (r 1 , p1 ; r 2 , p2 ; t) = = Na (Na − 1) D(r 1 , p1 ; .