S9Hr)y?m{f

where / and g are now functions of the radial coordinate only and the phase factor i multiplying the lower components is introduced for convenience. Note that (6.14) incorporates the results of (6.11) by explicitly using 3^'s with opposite parity to describe the upper and lower components. With the construction (6.14), the states are now eigenstates of angular momentum and parity, with the usual properties

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