Let x0 of type ι be given.
Apply complex_I with
CSNo_Re x0,
minus_SNo (CSNo_Im x0) leaving 2 subgoals.
Apply complex_Re_real with
x0.
The subproof is completed by applying H0.
Apply real_minus_SNo with
CSNo_Im x0.
Apply complex_Im_real with
x0.
The subproof is completed by applying H0.