Definition:Contour Integral/Complex/Closed

Definition
Let $C$ be a closed contour in $\C$.

Then the symbol $\displaystyle \oint$ is used for the contour integral on $C$.

The definition remains the same:


 * $\displaystyle \oint_C f \left({z}\right) \rd z := \sum_{i \mathop = 1}^n \int_{a_i}^{b_i} f \left({\gamma_i \left({t}\right) }\right) \gamma_i' \left({t}\right) \rd t$