diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index e489537..8ff7652 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -13,12 +13,12 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "SS2026/Quantum Computing/3. Quantum Systems/Quantum Systems.md",
+                "file": "SS2026/Quantum Computing/4. Observing and measuring/Observing probabilistic and measuring quantum systems.md",
                 "mode": "source",
                 "source": false
               },
               "icon": "lucide-file",
-              "title": "Quantum Systems"
+              "title": "Observing probabilistic and measuring quantum systems"
             }
           }
         ]
@@ -216,12 +216,16 @@
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   "active": "25f5b25d5eca7203",
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+    "SS2026/Quantum Computing/4. Observing and measuring/Anhänge",
+    "SS2026/Quantum Computing/3. Quantum Systems/Quantum Systems.md",
+    "SS2026/Quantum Computing/4. Observing and measuring/Observing probabilistic and measuring quantum systems.md",
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     "SS2026/Quantum Computing/3. Quantum Systems/Anhänge",
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@@ -243,13 +247,10 @@
     "SS2026/Datenbanken und Informationssysteme/6. Relationale Entwurfstheorie/Relationale Entwurfstheorie.md",
     "SS2026/Datenbanken und Informationssysteme/7. Transaktionsverwaltung/Transaktionsverwaltung.md",
     "SS2026/Datenbanken und Informationssysteme/MongoDB/MongoDB.md",
-    "SS2026/Datenbanken und Informationssysteme/MongoDB",
     "SS2026/Datenbanken und Informationssysteme/8. Alternative Datenmodelle und No-SQL/Alternative Datenmodelle und No-SQL.md",
-    "SS2026/Datenbanken und Informationssysteme/9. RDF und Semantic Web/Anhänge/RDF-combined.pdf",
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     "SS2026/Datenbanken und Informationssysteme/4. SQL/TCL Transaction Control Language SQL.md",
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@@ -261,7 +262,6 @@
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-    "SS2026/Datenbanken und Informationssysteme/2. ER-Modell/Konzeptueller Entwurf.md",
-    "SS2026/Datenbanken und Informationssysteme/2. ER-Modell/Erweitertes Konzept isA.md"
+    "SS2026/Datenbanken und Informationssysteme/2. ER-Modell/Konzeptueller Entwurf.md"
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diff --git a/SS2026/Quantum Computing/4. Observing and measuring/Anhänge/Pasted image 20260729093733.png b/SS2026/Quantum Computing/4. Observing and measuring/Anhänge/Pasted image 20260729093733.png
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diff --git a/SS2026/Quantum Computing/4. Observing and measuring/Observing probabilistic and measuring quantum systems.md b/SS2026/Quantum Computing/4. Observing and measuring/Observing probabilistic and measuring quantum systems.md
new file mode 100644
index 0000000..77e80a8
--- /dev/null
+++ b/SS2026/Quantum Computing/4. Observing and measuring/Observing probabilistic and measuring quantum systems.md	
@@ -0,0 +1,8 @@
+Observing = learning outcome
+
+![[Pasted image 20260729093733.png]]
+
+Because after observing all possibilities collapse to one.
+
+Example:
+