diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 45df3b6..255566b 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -13,7 +13,7 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "Algo/Séminaire/Exercices sémaines.md",
+                "file": "Algo/Séminaire/Chapter 1 - CAML basics.md",
                 "mode": "source",
                 "source": false
               }
@@ -85,7 +85,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "Algo/Séminaire/Exercices sémaines.md",
+                "file": "Algo/Séminaire/Chapter 1 - CAML basics.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -102,7 +102,7 @@
             "state": {
               "type": "outgoing-link",
               "state": {
-                "file": "Algo/Séminaire/Exercices sémaines.md",
+                "file": "Algo/Séminaire/Chapter 1 - CAML basics.md",
                 "linksCollapsed": false,
                 "unlinkedCollapsed": true
               }
@@ -125,7 +125,7 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "Algo/Séminaire/Exercices sémaines.md"
+                "file": "Algo/Séminaire/Chapter 1 - CAML basics.md"
               }
             }
           }
@@ -146,10 +146,10 @@
       "command-palette:Open command palette": false
     }
   },
-  "active": "c473a791e2b34194",
+  "active": "13c9bfe482ec2d42",
   "lastOpenFiles": [
-    "Algo/Séminaire/Chapter 3 - Case analysis.md",
     "Algo/Séminaire/Exercices sémaines.md",
+    "Algo/Séminaire/Chapter 3 - Case analysis.md",
     "Algo/Séminaire/Chapter 1 - CAML basics.md",
     "Algo/Séminaire/Chapter 2 - Functions.md",
     "Algo/Séminaire/assets/69E2987C-209A-48CD-8964-5A60462966E5.jpg",
diff --git a/Algo/Séminaire/Chapter 1 - CAML basics.md b/Algo/Séminaire/Chapter 1 - CAML basics.md
index 4564939..c528bf7 100644
--- a/Algo/Séminaire/Chapter 1 - CAML basics.md	
+++ b/Algo/Séminaire/Chapter 1 - CAML basics.md	
@@ -11,7 +11,7 @@ It's a simple language to write.
 - **;;** is the end of the line
 
 ```Ocaml
-_: int=3 (*That a Caml answer to the previus program*)
+_: int=3 (*That a Caml answer to the previous program*)
 ```
 
 ```Ocaml
diff --git a/Algo/Séminaire/Exercices sémaines.md b/Algo/Séminaire/Exercices sémaines.md
index b5c42eb..7fa130c 100644
--- a/Algo/Séminaire/Exercices sémaines.md	
+++ b/Algo/Séminaire/Exercices sémaines.md	
@@ -81,8 +81,23 @@ if a == b then
 else false
 
 (*logical or*)
-if a == b then
+if a && b then
 	true
-else if a && if !b
+else if a && not b then
+	true
+else if not a && b then
+	true
+else 
+	false
+
+(*logical implication*)
+if a && b then
+	true
+else if not a && b then
+	true
+else if not a && not b then
+	true
+else 
+	false
 ```