Homework Statement
Hi, guys, I just wondering what's the normal order of A +B
Homework Equations
if N[A+B]=N[A]+N[B]
then I have
N[aa^{\dagger}]=N[1-a^{\dagger}a]=1-a^{\dagger}a
however we know that
N[aa^{\dagger}]=-a^{\dagger}a]
what's wrong?
The Attempt at a Solution...