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**1. Homework Statement**

I am so confused about what a "hole orbit" is in condensed matter physics. I can identify it in the reduced zone scheme but what does it mean physically?

Also, my book talks about open orbits which I am also confused about. Are open orbits subsets of hole orbits or are they subsets of electron orbits or both or are they subsets of neither? I have no idea? I am so confused!?!?

**2. Homework Equations**

**3. The Attempt at a Solution**