+Cauchy's Theorem, a cornerstone of [Complex Analysis](/wiki/Complex_Analysis), reveals profound properties of [Analytic Functions](/wiki/Analytic_Function). It states that the contour integral of such a function over a closed loop within a simply connected domain is always zero. This elegant result underpins much of advanced mathematics.
+## See also
+- [Residue Theorem](/wiki/Residue_Theorem)
+- [Cauchy Integral](/wiki/Cauchy_Integral)
+- [Complex Plane](/wiki/Complex_Plane)
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