Originally posted by Aether
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The early lectures esp those of Steinmetz are different from the currently taught texts. One has to research the various changes in math that have occurred. Laplace transforms and Dirac delta derivative have replaced the original Heaviside work with little notation of it.
The resurgence of the use of quaternions and bi, oct etc.. are a result of pushing further into quantum physics. This has a direct tie into what Eric is sharing here with the group. admittedly this would be advanced beyond the traditional application Eric is trying to convey, however a deeper understanding of the nature of these longitudinal scalar waves will allow for further development. Eric mentions the power from the square root of negative 1, I won't spoil his fun here on this one however this relation is clearer if....
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