Components of a Complex Dynamic Function

Interrelations between the Components of a Complex Dynamic Function 

If both components of G are known at a single frequency, both components of J can be very simply calculated by equations 27 to 30 of Chapter 1. On the other hand, if one component is known over the whole frequency range, the other can be obtained from it by mechanical analogs of the Kronig-Kramers relations.  

To calculate J from J , for example, it is necessary, for each point desired (o)i), to evaluate the integral of equation 49 graphically or numerically. The integration has features similar to those of equations 21 and 22 which connect the relaxation and retardation spectra.22 There are analogous interrelations between G and 

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