diff --git a/src/2026-01-16/presentation.tex b/src/2026-01-16/presentation.tex
index 5e05529..048dc78 100644
--- a/src/2026-01-16/presentation.tex
+++ b/src/2026-01-16/presentation.tex
@@ -258,7 +258,7 @@
                 \right.
             \end{gather*}
             \vspace*{5mm}
-            \pause\begin{gather}
+            \pause\begin{gather*}
                 \mathcal{J} = \begin{pmatrix}
                     \frac{\partial x}{\partial u} & \frac{\partial x}{\partial v}  \\[2mm]
                     \frac{\partial y}{\partial u} & \frac{\partial y}{\partial v}
@@ -267,7 +267,7 @@
                      1 & 0 \\
                      - \frac{v}{u^2} & \frac{1}{u}
                 \end{pmatrix}
-            \end{gather}
+            \end{gather*}
             \begin{align*}
                 f_{U,V}(u,v) &= \lvert \text{det}(\mathcal{J}) \rvert
                     \cdot f_{X,Y} \big(h_1(u,v),h_2(u,v)\big)