Editing Argument principle (section)

==References==
{{Reflist}}
* {{cite book | last=Rudin | first=Walter | title = Real and Complex Analysis (International Series in Pure and Applied Mathematics) | publisher=McGraw-Hill | year=1986 |isbn=978-0-07-054234-1}}
* {{cite book | last=Ahlfors | first=Lars | title = Complex analysis: an introduction to the theory of analytic functions of one complex variable | publisher=McGraw-Hill | year=1979 |isbn=978-0-07-000657-7}}
* {{cite book | last1=Churchill | first1=Ruel Vance | last2=Brown | first2=James Ward | title = Complex Variables and Applications | publisher=McGraw-Hill | year=1989 |isbn=978-0-07-010905-6}}
* Backlund, R.-J. (1914) Sur les zéros de la fonction zeta(s) de Riemann, C. R. Acad. Sci. Paris 158, 1979–1982.