diff --git a/.obsidian/app.json b/.obsidian/app.json
index ede4d89..5dd7d4a 100644
--- a/.obsidian/app.json
+++ b/.obsidian/app.json
@@ -5,6 +5,6 @@
     "pageSize": "A4",
     "landscape": false,
     "margin": "0",
-    "downscalePercent": 100
+    "downscalePercent": 84
   }
 }
\ No newline at end of file
diff --git a/.obsidian/appearance.json b/.obsidian/appearance.json
index f68b492..4be7969 100644
--- a/.obsidian/appearance.json
+++ b/.obsidian/appearance.json
@@ -1,3 +1,3 @@
 {
-  "theme": "system"
+  "theme": "obsidian"
 }
\ No newline at end of file
diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index a28ffff..99738de 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -11,14 +11,16 @@
             "id": "51157f32453cba69",
             "type": "leaf",
             "state": {
-              "type": "markdown",
+              "type": "pdf",
               "state": {
-                "file": "Concurrent Systems/notes/1b - Peterson algorithm.md",
-                "mode": "source",
-                "source": false
+                "file": "Concurrent Systems/slides/class 2.pdf",
+                "page": 5,
+                "left": -11,
+                "top": 63,
+                "zoom": 1.35124703087886
               },
-              "icon": "lucide-file",
-              "title": "1b - Peterson algorithm"
+              "icon": "lucide-file-text",
+              "title": "class 2"
             }
           }
         ]
@@ -195,16 +197,17 @@
   },
   "active": "51157f32453cba69",
   "lastOpenFiles": [
+    "Concurrent Systems/slides/class 3.pdf",
+    "Concurrent Systems/notes/3a - Hardware primitives & Lamport Bakery algorithm.md",
+    "Concurrent Systems/notes/1b - Peterson algorithm.md",
     "Concurrent Systems/notes/4c - Dining Philosophers.md",
     "Concurrent Systems/notes/2b - Round Robin algorithm.md",
     "Concurrent Systems/notes/2 - Fast mutex by Lamport.md",
-    "Concurrent Systems/notes/1b - Peterson algorithm.md",
     "Concurrent Systems/notes/Untitled.pdf",
     "Concurrent Systems/notes/1 - CS Basics.md",
     "Concurrent Systems/notes/4 - Semaphores.md",
     "Concurrent Systems/notes/4b - Monitors.md",
     "Concurrent Systems/notes/3b - Aravind's algorithm and improvements.md",
-    "Concurrent Systems/notes/3a - Hardware primitives & Lamport Bakery algorithm.md",
     "Concurrent Systems/notes/5 - Software Transactional Memory.md",
     "Concurrent Systems/notes/6 - Atomicity.md",
     "conflict-files-obsidian-git.md",