Quasi-linear approximation of the modified Greens operator

3-4 Quasi-linear approximation of the modified Green s operator We will obtain a more accurate approximation even on the first step if we assume that the anomalous field E inside the inhomogeneous domain is not equal to zero, as it was supposed in the previous section, but is linearly related to the background field E by some tensor A  

Subsequently, wc use the expression (9.148) as the zero order approximation for the scattered field inside the inhomogeneity, 

We call this approximation a quasi linear approximation of the first order Eq or a modified quasi-linear approximation (MQL) E)(fQ for an anomalous field  

Note that conventional QL approximation is given by the formula 

Obviously, outside inhomogeneities, where Act = 0, the MQL approximation is identically equal to the conventional QL approximation  

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