diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index ed35cf8..08af3a0 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -13,7 +13,7 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "Algo/Séminaire/Chapter 3 - Case analysis.md",
+                "file": "Algo/Séminaire/Exercices sémaines.md",
                 "mode": "source",
                 "source": false
               }
@@ -85,7 +85,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "Algo/Séminaire/Chapter 3 - Case analysis.md",
+                "file": "Algo/Séminaire/Exercices sémaines.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -102,7 +102,7 @@
             "state": {
               "type": "outgoing-link",
               "state": {
-                "file": "Algo/Séminaire/Chapter 3 - Case analysis.md",
+                "file": "Algo/Séminaire/Exercices sémaines.md",
                 "linksCollapsed": false,
                 "unlinkedCollapsed": true
               }
@@ -125,7 +125,7 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "Algo/Séminaire/Chapter 3 - Case analysis.md"
+                "file": "Algo/Séminaire/Exercices sémaines.md"
               }
             }
           }
@@ -148,11 +148,11 @@
   },
   "active": "13c9bfe482ec2d42",
   "lastOpenFiles": [
-    "Algo/Séminaire/Chapter 2 - Functions.md",
     "Algo/Séminaire/Chapter 3 - Case analysis.md",
     "Algo/Séminaire/Exercices sémaines.md",
-    "Algo/Séminaire/assets/69E2987C-209A-48CD-8964-5A60462966E5.jpg",
     "Algo/Séminaire/Chapter 1 - CAML basics.md",
+    "Algo/Séminaire/Chapter 2 - Functions.md",
+    "Algo/Séminaire/assets/69E2987C-209A-48CD-8964-5A60462966E5.jpg",
     "Algo/Séminaire/Introduction.md",
     "Algo/Séminaire/assets",
     "Algo/Séminaire/assets/F1D2AA19-E790-4022-AFFF-F778EAB28AB5.jpg",
diff --git a/Algo/Séminaire/Exercices sémaines.md b/Algo/Séminaire/Exercices sémaines.md
index 52b8f37..c20e84c 100644
--- a/Algo/Séminaire/Exercices sémaines.md	
+++ b/Algo/Séminaire/Exercices sémaines.md	
@@ -49,5 +49,12 @@ val stammer: int -> int = <fun>
 
 
 
+## Exercice 2.6
+```Ocaml
+let sef_of_time h m s = 
+	h*3600 + m*60 + s ;;
 
+let time_of_sec s = 
+	let hours = s/3600 and  minutes = s mod 60 and  seconds = s mod 3600 in (hours, minutes, seconds)
 
+```