Fermion parity
= Fermion parity
{title2=$(-1)^F$}
{wiki}
Fermion parity is $(-1)^F$. It acts as plus one on bosonic states and minus one on fermionic states. Even operators commute with it and odd operators, including supersymmetry generators, anticommute with it. Local observables are parity even because observable algebras of spacelike separated regions must commute.