\begin{definition}[Definition:Reversed Contour]
Let $\R^n$ be a real cartesian space of $n$ dimensions.
Let $C$ be a contour in $\R^n$.
Then $C$ is defined as a concatenation of a finite sequence $C_1, \ldots, C_n$ of directed smooth curves in $\R^n$.
The '''reversed contour of $C$''' is denoted $-C$ and is defined as the concatenation of the finite sequence:
:$-C_n, -C_{n - 1}, \ldots, -C_1$
where $-C_i$ is the reversed directed smooth curve of $C_i$ for all $i \in \left\{ {1, \ldots, n}\right\}$.
\end{definition}