chore: update wg04 paper with more definition.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/source/wg04/paper.tex b/source/wg04/paper.tex
index e983b2c..55954bf 100644
--- a/source/wg04/paper.tex
+++ b/source/wg04/paper.tex
@@ -47,7 +47,7 @@ We assume $x, y, z \in \mathbb{R}, \quad n \in \mathbb{N}, \quad \cos(\pi) < a <
 Where $\Delta t \in \mathbb{R}$ if and only if $0 < \Delta t$.
 \subsection{DEFINITION OF THE K-EQUATION:}
 \begin{equation}
-	K_{n}(u_{n}, a, b) \coloneqq \int_{a}^{b} S_{n}(u_{n}) \quad d \cdot u_{n}, \quad \forall u_{n} \in \mathbb{R}
+	K_{n}(u_{n}, a, b) \coloneqq \int_{a}^{b} S_{n}(u_{n}) \quad d \cdot u_{n}, \quad \forall u_{n}, S_{n}(u_{n}) \in \mathbb{R}
 \end{equation}
 Where $K_{n} > 0$ and $S_{n}(u_{n})$ is an A-Function of index $n$ at $u$.