diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index a3ebeba..7f5db7d 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -189,7 +189,7 @@
       "companion:Toggle completion": false
     }
   },
-  "active": "0d5325c0f9289cea",
+  "active": "2b2245f56092006e",
   "lastOpenFiles": [
     "Concurrent Systems/notes/1b - Peterson algorithm.md",
     "Concurrent Systems/slides/class 5.pdf",
@@ -223,7 +223,7 @@
     "Foundation of data science/notes/9 K-Nearest Neighbors.md",
     "HCIW/slides/1 Interface and Interaction for IoT.pdf",
     "Concurrent Systems/slides/class 4.pdf",
-    "Concurrent Systems/slides/class 9.pdf",
+    "Foundation of data science/class 9.pdf",
     "Concurrent Systems/slides/class 10.pdf",
     "Concurrent Systems/ignore this folder",
     "HCIW/slides/Tangible User Interfaces.pdf",
diff --git a/Concurrent Systems/slides/class 9.pdf b/Foundation of data science/class 9.pdf
similarity index 100%
rename from Concurrent Systems/slides/class 9.pdf
rename to Foundation of data science/class 9.pdf