I won't be there for today's class. What I would like you to do is to work together, perhaps in groups, on creating the model for magnetism based on the concepts in the post "Influence of electron interactions in a band metal."
The key things are the dependence of the total band energy on Nup using the constant D(E) assumption, and the dependence of the total e-e energy on Nup based on counting pairs and our assumed difference between same spin and opposite spin pairs. (See my comment reply to Georges comment to the post "Influence of electron interactions in a band metal.".
I would strongly suggest that you not spend much time questioning the assumptions. I don't think you will get anywhere with that. We will address those issues on Friday.
Count pairs. Get graphs of the total band energy and the e-e energy as a function of Nup.
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