vault backup: 2026-04-08 17:42:58

10 Courses/02 - SoSe 2026/AT/29593952 - Regular Languages.md

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+---
+created: 2026-04-08 10:32
+course: "[[29593850 - Automationtheory]]"
+topic: languages
+related: "[[29593940 - Formal Languages]]"
+type: lecture
+status: 🔴
+tags:
+  - university
+---
+## 📌 Summary
+
+> [!abstract]
+> 
+
+---
+
+## 📝 Content
+
+A language $L$ that can be described by a [[29593975 - Regular Expressions|Regular Expression]] $r$ (i. e. $L(r) = L$) is called _regular_.
+
+> [!WARNING]
+> There a several important languages that **cannot** be described by a regular expression.
+> <mark style="background: #CACFD9A6;">(proof later)</mark>