йо п б жгз гд дг а
йо п б жгз гд дг а
йо п б жгз гд дг а
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ÓÖÓÚ¹ÈÐÒÓÚÖÓÚÒ ÍÚúÙÑÙ×ØÓØÙÔÖÚÔÓÓÒÓ×Øρ(x,p)¸p ÈÖÚÔÓÓÒÓ×ØÒÐÞÒ=×ØÚÓÐ×ØA =∫ρ(x,p,t)dxdp = 1mẋ´ÔÖÓ½×ص·14/26s13∫AÑÒÚ×ØÓÔÖÚÔÓÓÒÓ×Ø×ØÒÑAδx×δpρ(x,p,t)dxdp ≈ ρ(x,p,t)δxδp∂ρδxδp = −[(ρẋ)(x+δx)−(ρẋ)(x)]δp−[(ρṗ)(p+δp)−(ρṗ)(p)]δx∂tÆÓÞÐÓÖÑ ÐÒÞÖÓÚÒÓÒØÒÙØÝ´ÔÖÚÔÓÓÒÓ×Ø×ÒÞØÖص∂ρ∂t = −∂ẋρ ∂x − ∂ṗρ∂pdρdt = 0
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