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## Main Question or Discussion Point

Hi

I've heard this term a few times and I couldn't find a definition in textbooks..

What is the definition of Particle-hole symmetry?

I gather it's something like taking c -> c

What does it mean, anyway?

Where can I read about this symmetry?

Thanks

I've heard this term a few times and I couldn't find a definition in textbooks..

What is the definition of Particle-hole symmetry?

I gather it's something like taking c -> c

^{+}, but is there a definition of an symmetry operator that commutes with the hamiltonian or something?What does it mean, anyway?

Where can I read about this symmetry?

Thanks