Dipole interaction correction to effective conductivity
= Dipole interaction correction to effective conductivity
{title2=$a^*\approx a_0I+p\beta I-\beta^2\sum_i\Lambda_i$}
If the first exciting-field correction at inclusion $i$ is $-\beta\Lambda_iE/p_i$, its revised polarization is $\beta\chi_i(E-\beta\Lambda_iE/p_i)$. Averaging weights it by $p_i$ and gives the displayed second-reflection approximation. Further dipole reflections and finite-size multipoles are neglected.