Do Fermionic Creation and Annihilation Operators Commute?

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SUMMARY

The discussion confirms that fermionic creation and annihilation operators, denoted as c_{i,\sigma}^\dag and c_{i,\sigma}, do not commute but rather satisfy the anticommutation relation c_{i,\sigma} c_{i,\sigma}^\dag = 1 - c_{i,\sigma}^\dag c_{i,\sigma}. This relationship is fundamental in quantum mechanics, particularly in the context of fermionic systems where the Pauli exclusion principle applies. The operators are characterized by quantum numbers i and spin σ, emphasizing their role in describing fermionic particles.

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Niles
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Hi guys

The fermionic creating and annihiliations operators: Do they satisfy

<br /> c_{i,\sigma }^\dag c_{i,\sigma }^{} = - c_{i,\sigma }^{} c_{i,\sigma }^\dag <br />

for some quantum number i and spin σ, i.e. do they commute?
 
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yes they satisfy that, but that is called ANTIcommute
 
<br /> c_{i,\sigma } c_{i,\sigma }^{\dag} = 1 - c_{i,\sigma }^{\dag} c_{i,\sigma } <br />
 

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