Matrix form of quasi-linear approximation

Expression (9.79) for the quasi-linear approximation of the anomalous field can be written in discrete form as 

In a special case when we use a scalar electrical reflectivity coefficient, equation (9.223) takes the form 

TTij = (1 -f Aj) A5, t = 1,2,. N. Finally, we can introduce a modified conductivity vector m, m = and present the quasi-linear approximation in the form (9.228) 

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