(x + y) min 2and
xy min 2That is: normal + and x, followed by replacing any number greater than 2 by 2.
Ha* psi = (a* H + [H,a*]) psi = (a*H + a*) psi = (a*E + a*) psiWe left out the "psi" on the third line.
Delta^{2}_{psi}(A + C)and end with
Delta^{2}_{psi} AWe left out the squares.