diff --git a/examples/Frames and Coordinate Systems.ipynb b/examples/Frames_and_Coordinate_Systems.ipynb
similarity index 100%
rename from examples/Frames and Coordinate Systems.ipynb
rename to examples/Frames_and_Coordinate_Systems.ipynb
diff --git a/examples/Track Corridor.ipynb b/examples/Track_Corridor.ipynb
similarity index 100%
rename from examples/Track Corridor.ipynb
rename to examples/Track_Corridor.ipynb
diff --git a/examples/Vectors and Coordinates.ipynb b/examples/Vectors_and_Coordinates.ipynb
similarity index 99%
rename from examples/Vectors and Coordinates.ipynb
rename to examples/Vectors_and_Coordinates.ipynb
index 8ec7ed771d2ab909762489aa766e6308e2713d77..4bcace7946a71ff7d9ecfce31ceab33a27b43e48 100644
--- a/examples/Vectors and Coordinates.ipynb	
+++ b/examples/Vectors_and_Coordinates.ipynb
@@ -124,7 +124,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [
     {
@@ -133,7 +133,7 @@
        "<Vector3D: {10; 0; 0}>"
       ]
      },
-     "execution_count": 8,
+     "execution_count": 6,
      "metadata": {},
      "output_type": "execute_result"
     }