diff --git a/.obsidian/community-plugins.json b/.obsidian/community-plugins.json
index 7549424..8a200ce 100644
--- a/.obsidian/community-plugins.json
+++ b/.obsidian/community-plugins.json
@@ -5,6 +5,5 @@
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   "local-gpt",
   "companion",
-  "pdf-plus",
   "obsidian-latex-suite"
 ]
\ No newline at end of file
diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 83978c7..dd19bfa 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -6,10 +6,9 @@
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         "type": "tabs",
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-            "id": "105f7a61963f10e7",
+            "id": "149ad8d7dea2048d",
             "type": "leaf",
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@@ -21,44 +20,6 @@
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-            "id": "149ad8d7dea2048d",
-            "type": "leaf",
-            "state": {
-              "type": "markdown",
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-                "mode": "source",
-                "source": false
-              },
-              "icon": "lucide-file",
-              "title": "7- MUTEX-free concurrency"
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-        "type": "tabs",
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-            "type": "leaf",
-            "state": {
-              "type": "pdf",
-              "state": {
-                "file": "Concurrent Systems/slides/class 7.pdf",
-                "page": 1,
-                "left": -23,
-                "top": 126,
-                "zoom": 0.680522565320665
-              },
-              "icon": "lucide-file-text",
-              "title": "class 7"
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       }
@@ -117,8 +78,7 @@
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     ],
     "direction": "horizontal",
-    "width": 307.5,
-    "collapsed": true
+    "width": 307.5
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   "right": {
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@@ -213,8 +173,7 @@
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     ],
     "direction": "horizontal",
-    "width": 364.5,
-    "collapsed": true
+    "width": 364.5
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     "hiddenItems": {
@@ -233,18 +192,19 @@
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-  "active": "149ad8d7dea2048d",
+  "active": "0d5325c0f9289cea",
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+    "Concurrent Systems/notes/6a - Alternatives to Atomicity.md",
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+    "Concurrent Systems/notes/6 - Atomicity.md",
     "Concurrent Systems/notes/7- MUTEX-free concurrency.md",
     "Pasted image 20250324100652.png",
     "Pasted image 20250324092633.png",
     "Pasted image 20250324091452.png",
     "Concurrent Systems/notes/Pasted image 20250324082534.png",
-    "Concurrent Systems/notes/6a - Alternatives to Atomicity.md",
     "Concurrent Systems/slides/class 6.pdf",
     "Concurrent Systems/notes/Pasted image 20250324082545.png",
-    "Concurrent Systems/notes/6 - Atomicity.md",
     "Concurrent Systems/notes/5 - Software Transactional Memory.md",
     "Concurrent Systems/notes/4b - Monitors.md",
     "Concurrent Systems/slides/class 4.pdf",
@@ -258,7 +218,6 @@
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     "Concurrent Systems/notes/1b - Peterson algorithm.md",
     "Concurrent Systems/notes/Untitled.pdf",
-    "Concurrent Systems/notes/1 - CS Basics.md",
     "conflict-files-obsidian-git.md",
     "Concurrent Systems/notes/images/Pasted image 20250318090909.png",
     "Concurrent Systems/notes/images/Pasted image 20250318090733.png",