The pole-pole, pole-dipole, and dipole-dipole are electrode arrays frequently utilized in geoelectrical soundings. In view of some classical applications, such as the transformation of sounding curves (Patella, 1974) and the computation of standard curves by means of digital linear filters (Ghosh, 1971; Kumar and Das, 1978), I derive in the present note the relationships existing between the apparent resistivity functions of the pole-dipole and dipole-dipole classes of arrays and the apparent resistivity function of the pole-pole system in the case of complicated underground structures. Before doing this, I first review the main features of the above arrays.

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