Occupation number
= Occupation number
{title2=$n_k$}
The eigenvalue of a mode number operator counts excitations in that mode. <Bosonic occupation numbers> range over all nonnegative integers; <fermionic occupation numbers> are zero or one.
= Occupation number
{title2=$n_k$}
The eigenvalue of a mode number operator counts excitations in that mode. <Bosonic occupation numbers> range over all nonnegative integers; <fermionic occupation numbers> are zero or one.