If in a system | P ⟩ and | P ¯ ¯ ⟩ represent CP conjugate states (i.e. particle-antiparticle) of one another (i.e. C P | P ⟩ = e i δ δ | P ¯ ¯ ⟩ and C P | P ¯ ¯ ⟩ = e − − i δ δ | P ⟩ ), and certain other conditions are met, then CP violation can be observed as a result of this phenomenon. Depending on the condition, CP violation can be classified into three types: