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Earlier a variable Q was defined from the pressure P by the equation
 
(42) 
The right side is a product of two functions of .At constant velocity (42) is expressed as
 
(43) 
In the time domain becomes a delta function .Equation (43) is a product in the frequency domain,
so in the time domain it is the convolution
 

 
 (44) 
This confirms that the definition of a
dependent variable Q is equivalent
to introducing retarded time t'.
Next: Einstein's special relativity theory
Up: RETARDED COORDINATES
Previous: Fourier transforms in retarded
Stanford Exploration Project
10/31/1997