On mechanical resonances and anti-resonances
... associated with the preparation and solution of differential equations have been replaced by simple algebraic transformations. The method is based on the mechanical analogue of Ohm's law in a complex representation and the concept of mechanical reactance, resistance, impedance, susceptance, conductance and admittance.
Popov I. P.
reactance, resistivity, impedance, susceptance, conductance, admittance