Supersymmetry is spontaneously broken if the ground state ∣0⟩ is not annihilated by all the supercharges.
a) Use the first of eqs. (95.34) to show that supersymmetry is spontaneously broken if ⟨0∣F∣0⟩=0.
b) Compute {λa,Qb}. Use the result to show that supersymmetry is spontaneously broken if ⟨0∣D∣0⟩=0.