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Some General Purpose Formulas and Definitions

General Purpose Formulas
Function (or Signal) Metrics
CT signal energy $ E_\infty=\int_{-\infty}^\infty | x(t) |^2 dt $
DT signal energy $ E_\infty=\sum_{n=-\infty}^\infty | x[n] |^2 $

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Abstract algebra continues the conceptual developments of linear algebra, on an even grander scale.

Dr. Paul Garrett