Hi,(adsbygoogle = window.adsbygoogle || []).push({});

I'm studying statistical mechanics from Reif's book.

In his book Reif is reaching the conclusion that the number of states avaiable to a system at energy E (up to some small uncertainty in the energy due to finite observation) with f degrees of freedom is proportional to E^f .

There is a "not so much" of a proof of this lemma in his book, he assumes many things in that so called proof.

could any one please refer me to an exact proof?

By the way, I did an introductionary course in qunatum physics so feel about free to refer me to formal proofs.

Another small question: Does the "a-priori probability" theorem in quantum statistical mechanics comesdirectlyfrom Von Neumann's equation? Or do I have to postulate something else?

Thank you very much for helping. I am sorry for my bad english.

Ehud.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Statistical mechanics - density of states

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

**Physics Forums | Science Articles, Homework Help, Discussion**