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 \(N_{up}\) using the constant D(E) assumption, and the dependence of the total e-e energy on \(N_{up}\) 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 \(N_{up}\).
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