View source for Errata: In Theorem 9.3, N should be Z

<!-- This is a template page for creating an erratum.  You should include this page using the subst: operator -->
{{errata page
| chapter = Frequency Domain Analysis
| page = 277
| line = 13
| contributor = E. Tuna
| date = 5 Apr 08
| version = First printing
| text = 
In the displayed equation in Theorem 9.3, <math>N</math> should be <math>Z</math>, the number of zeros:
<center><amsmath>
  w_n=\frac{1}{2\pi}\Delta_\Gamma \arg f(z) =\frac{1}{2\pi
  i}\int_\Gamma\frac{f'(z)}{f(z)}dz = {\boldmath {Z}} - P,
</amsmath></center>
}}