diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
index e4376a6d6..53f146257 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
@@ -588,13 +588,13 @@ Figure à créer.
 
 en relación a esta figura / en relation avec cette figure / in relation to this figure
 
-![](differential_PolyINSA.png)
+![](vector-differential_PolyINSA.png)
 
 $`d\left(\overrightarrow{OM}(t)\right)=\overrightarrow{OM}(t+dt)-\overrightarrow{OM}(t)`$
 
 $`d\overrightarrow{OM}=||\overrightarrow{OM}|| \cdot\overrightarrow{e_{||}}`$
 
-$`\Psy=\Psy(t+dt)-\Psy(t)`$
+$`\Psi=\Psi(t+dt)-\Psi(t)`$
 
 $`d\left(\overrightarrow{OM}(t)\right)=d\left(\overrightarrow{OM}(t)\right)_{||}+d\left(\overrightarrow{OM}(t)\right)_{\perp}`$