With the recent relative advancement of Technology, particularly with the digital storage oscilloscopes, we analyze precursor signals. They became known in the literature, precursor signals. However they are usually attributed to a symmetrical Fourier analysis of square pulses with dual time components, one unnatural time prior the pulse event and second a natural time after the pulse event.
However, every arbitrary mathematical analysis may not be suitable for a particular physical case, as the complex solutions of an equation of a physical problem are usually rejected, as complex numbers solutions. Also, a particular mathematical number may be analyzed as the limit of an infinite number of numerical sequences. This does not mean that every term of each such sequence, plays a real role in a physical situation.
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