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^(i«2i = -V2 »-r —nvs

- (1 ,,2) __ Y* — c2 / — U V s

dt2

'l\ (1«,•) = 2 X T— M- # — y2 * —« w(f -f1)

rfl-

Tlie ("[iiations ot' energy equilibrium give

[A'2] 0 [,]

[«2] : [Y2] M M

[2 AT] W [r+<]

[A2] [r] W = [l-2] : [^2] 0 [•]

[2 AT] H [r+*]

[A2] [r] 0

= [«*] : [r2] 0 [/]

j [2 AT] [,] [,»] |

[r] (I W

= 1 : 0 M H (5)

j M W [r+q

We notice the following results.

(1) The mean value [«<'] does not necessarily vanish. Ihe condition of its vanishing reduces to

M | M [*2] + W [ ï"2] | - * W M m = o

Tliis is satisfied in particular by

[AT] = 0 and [#] = 0 as we sliould expect from general considerations.

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