diff --git a/report.tex b/report.tex
index 6750939..a67327b 100644
--- a/report.tex
+++ b/report.tex
@@ -282,8 +282,8 @@
     \begin{equation}
       \tensor{P}{^I_J}(\xi) = \begin{pmatrix}
         0 & 0 & 0 \\
-        0 & 0 & -\tensor{\xi}{_i} \\
-        0 & -\tensor{\xi}{^i} & 0
+        0 & 0 & -\myvec{\xi}^T \\
+        0 & -\myvec{\xi} & 0
       \end{pmatrix},
     \end{equation}
   \end{frame}