Van Leeuwen problem in cannonical ensemble

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Can someone explain to me about the van Leeuwen problem in classical stat physics and give me a complete step by step solutions to the problem.

I am a graduate student doing MS. I am new to statistical mechanics. So please explian as one should explain it to an ms student.

i have basic idea on microcannonical/cannonical/grand cannonical ensemble, and some basic ideas on quantum stat mech.

Thanks in advance.
 
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