 |
By regrouping the terms in 
, 
, 
, ... we have:
 |
As 
, we finally obtain:
 |
The 
pulsation and 
amplitude term is therefore the equivalent of the following set of harmonics:
pulsation
and 
, having both the same amplitude
and 
, having both the same amplitude
The amplitudes of the harmonics decrease rapidly as their pulsation pulls away from the pulsation wp.
· By a similar calculus, we can prove that the 
pulsation term of the pseudo development in Fourier series
 |
gives:
and 
having both the same amplitude
and 
having both the same amplitude
The harmonics group themselves in families situated around the pulsations 
, 
, 
,...
