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{{#category_index:L|linearity}} The property of a filter, amplifier, or intrinsic property where the output is directly proportional to the input. Linearity is usually limited to a certain range of amplitudes and frequencies. For example, (a) the proportional relationship between induced polarization and current density in which chargeability is constant, or (b) the symmetrical identity between voltage versus time of IP charge and decay curves, or (c) the proportionality between decay-curve amplitude and polarizing voltage.