< Page:Elementary Principles in Statistical Mechanics (1902).djvu
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76

AVERAGE VALUES IN A CANONICAL

For , this gives
(218)
which agrees with (191).
From (215) we have also
(219)
(220)

In like manner from the identical equation

(221)
we get
(222)
and
(223)

With respect to the kinetic energy similar equations will hold for averages taken for any particular configuration, or for the whole ensemble. But since

the equation
(224)
reduces to
(225)
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