In page 2 of Pathria's textbook on 'Statistical Mechanics,' it is mentioned that(adsbygoogle = window.adsbygoogle || []).push({});

Consider the total energy ##E## of the system. If the particles comprising the system could be regarded as noninteracting, the total energy ##E## would be equal to the sum of the energies ##\epsilon_i## of the individual particles:

##E = \sum_{i} n_{i}\epsilon_{i},##

where ##n_i## denotes the number of particles each with energy ##\epsilon_i##.

If the particles were mutually interacting, the total energy ##E##cannot be written in the form above.

Why can't the total energy be written in the form above for mutually interacting particles?

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# Pathria page 2 -- total energy for mutually interacting particles

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