H

differs from A w in Eq. 2.7.4 by a factor of the order of unity We shall consider the case v — 2. We neglect a spatial inhomogeneity of the system (dF/dz — 0, l — const) and follow a population of the range of angles between x = xo and x = x1 (xo << x << 1). The Eq. 2.7.13 takes the form dF 2 d2 F „ dF ■ = x —— + 2 x dT

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