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Tobin Fricke's Lab Notebook

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poles [Mar. 21st, 2012|11:56 am]
Tobin Fricke's Lab Notebook
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Bernard Friedland's explanation of the origin of the word "pole" (in Control System Design):
The roots of the denominator [of a rational function] are called the poles of the transfer function because H(s) becomes infinite at these complex frequencies and a contour map of the complex plane appears as if it has poles sticking up from these points. [emphasis mine]