diff --git a/.obsidian/snippets/matugen.css b/.obsidian/snippets/matugen.css
index 6d689fa..068094f 100644
--- a/.obsidian/snippets/matugen.css
+++ b/.obsidian/snippets/matugen.css
@@ -6,113 +6,113 @@
 .theme-dark, .theme-light {
 
     /* ── Material You RGB helpers ──────────────────────────── */
-    --mat-bg-rgb:             32, 15, 13;
-    --mat-surface-rgb:        32, 15, 13;
-    --mat-on-surface-rgb:     253, 219, 215;
-    --mat-primary-rgb:        255, 180, 172;
-    --mat-on-primary-rgb:     105, 0, 7;
+    --mat-bg-rgb:             32, 14, 14;
+    --mat-surface-rgb:        32, 14, 14;
+    --mat-on-surface-rgb:     254, 218, 217;
+    --mat-primary-rgb:        255, 179, 178;
+    --mat-on-primary-rgb:     104, 0, 19;
 
     /* ── Core Backgrounds ──────────────────────────────────── */
-    --background-primary:           #200f0d;
-    --background-primary-alt:       #200f0d;
-    --background-secondary:         #291715;
-    --background-secondary-alt:     #2d1b19;
+    --background-primary:           #200e0e;
+    --background-primary-alt:       #200e0e;
+    --background-secondary:         #291616;
+    --background-secondary-alt:     #2e1a1a;
 
     /* ── Titlebar ──────────────────────────────────────────── */
-    --titlebar-background:          #200f0d;
-    --titlebar-background-focused:  #291715;
-    --titlebar-text-color:          #fddbd7;
+    --titlebar-background:          #200e0e;
+    --titlebar-background-focused:  #291616;
+    --titlebar-text-color:          #fedad9;
 
     /* ── Borders & Dividers ────────────────────────────────── */
-    --background-modifier-border:         #5d3f3c;
-    --background-modifier-border-focus:   #ae8884;
-    --background-modifier-border-hover:   #ae8884;
+    --background-modifier-border:         #5e3f3e;
+    --background-modifier-border-focus:   #ae8786;
+    --background-modifier-border-hover:   #ae8786;
 
     /* ── Text Colors ───────────────────────────────────────── */
-    --text-normal:      #fddbd7;
-    --text-muted:       #e7bdb8;
-    --text-faint:       #ae8884;
-    --text-on-accent:   #690007;
-    --text-selection:   rgba(255, 180, 172, 0.25);
+    --text-normal:      #fedad9;
+    --text-muted:       #e8bcbb;
+    --text-faint:       #ae8786;
+    --text-on-accent:   #680013;
+    --text-selection:   rgba(255, 179, 178, 0.25);
 
     /* ── Accent & Interactive ──────────────────────────────── */
-    --interactive-accent:           #ffb4ac;
-    --interactive-accent-hover:     #de1521;
-    --interactive-accent-rgb:       255, 180, 172;
-    --text-accent:                  #ffb4ac;
-    --text-accent-hover:            #de1521;
+    --interactive-accent:           #ffb3b2;
+    --interactive-accent-hover:     #ff525d;
+    --interactive-accent-rgb:       255, 179, 178;
+    --text-accent:                  #ffb3b2;
+    --text-accent-hover:            #ff525d;
 
     /* ── Hover & Active Modifiers ──────────────────────────── */
     --background-modifier-hover:          rgba(var(--mat-on-surface-rgb), 0.06);
     --background-modifier-active-hover:   rgba(var(--mat-primary-rgb), 0.15);
-    --background-modifier-success:        #0075b9;
+    --background-modifier-success:        #2f9fa4;
     --background-modifier-error:          #93000a;
     --background-modifier-error-hover:    #ffb4ab;
 
     /* ── Obsidian Color Scale (--color-base-XX) ────────────── */
-    --color-base-00:    #200f0d;
-    --color-base-05:    #200f0d;
-    --color-base-10:    #1a0a08;
-    --color-base-20:    #291715;
-    --color-base-25:    #2d1b19;
-    --color-base-30:    #392523;
-    --color-base-35:    #452f2d;
-    --color-base-40:    #5d3f3c;
-    --color-base-50:    #ae8884;
-    --color-base-60:    #e7bdb8;
-    --color-base-70:    #fddbd7;
-    --color-base-100:   #fddbd7;
+    --color-base-00:    #200e0e;
+    --color-base-05:    #200e0e;
+    --color-base-10:    #1a0909;
+    --color-base-20:    #291616;
+    --color-base-25:    #2e1a1a;
+    --color-base-30:    #392524;
+    --color-base-35:    #452f2f;
+    --color-base-40:    #5e3f3e;
+    --color-base-50:    #ae8786;
+    --color-base-60:    #e8bcbb;
+    --color-base-70:    #fedad9;
+    --color-base-100:   #fedad9;
 
     /* ── Semantic Colors ───────────────────────────────────── */
     --color-red:        #ffb4ab;
-    --color-orange:     #98cbff;
-    --color-yellow:     #ffb4ac;
-    --color-green:      #0075b9;
-    --color-cyan:       #8b1919;
-    --color-blue:       #ffb4ac;
-    --color-purple:     #ffb4ac;
-    --color-pink:       #98cbff;
+    --color-orange:     #70d6db;
+    --color-yellow:     #ffb3b2;
+    --color-green:      #2f9fa4;
+    --color-cyan:       #8f0d21;
+    --color-blue:       #ffb3b2;
+    --color-purple:     #ffb3b2;
+    --color-pink:       #70d6db;
 
     /* ── Headings ──────────────────────────────────────────── */
-    --h1-color:     #ffb4ac;
-    --h2-color:     #ffb4ac;
-    --h3-color:     #ffb4ac;
-    --h4-color:     #98cbff;
-    --h5-color:     #e7bdb8;
-    --h6-color:     #ae8884;
+    --h1-color:     #ffb3b2;
+    --h2-color:     #ffb3b2;
+    --h3-color:     #ffb3b2;
+    --h4-color:     #70d6db;
+    --h5-color:     #e8bcbb;
+    --h6-color:     #ae8786;
 
     /* ── Links ─────────────────────────────────────────────── */
-    --link-color:           #ffb4ac;
-    --link-color-hover:     #ffffff;
-    --link-external-color:  #98cbff;
-    --link-unresolved-color: #ae8884;
+    --link-color:           #ffb3b2;
+    --link-color-hover:     #000000;
+    --link-external-color:  #70d6db;
+    --link-unresolved-color: #ae8786;
 
     /* ── Tags ──────────────────────────────────────────────── */
-    --tag-color:            #ffffff;
-    --tag-background:       #de1521;
-    --tag-border-color:     #ffb4ac;
-    --tag-color-hover:      #690007;
-    --tag-background-hover: #ffb4ac;
+    --tag-color:            #000000;
+    --tag-background:       #ff525d;
+    --tag-border-color:     #ffb3b2;
+    --tag-color-hover:      #680013;
+    --tag-background-hover: #ffb3b2;
 
     /* ── Checkboxes ────────────────────────────────────────── */
-    --checkbox-color:           #ffb4ac;
-    --checkbox-color-hover:     #de1521;
-    --checkbox-border-color:    #ae8884;
-    --checkbox-marker-color:    #690007;
+    --checkbox-color:           #ffb3b2;
+    --checkbox-color-hover:     #ff525d;
+    --checkbox-border-color:    #ae8786;
+    --checkbox-marker-color:    #680013;
 
     /* ── Code Blocks ───────────────────────────────────────── */
-    --code-background:  #291715;
-    --code-normal:      #fddbd7;
-    --code-comment:     #ae8884;
-    --code-function:    #ffb4ac;
+    --code-background:  #291616;
+    --code-normal:      #fedad9;
+    --code-comment:     #ae8786;
+    --code-function:    #ffb3b2;
     --code-important:   #ffb4ab;
-    --code-keyword:     #ffb4ac;
-    --code-operator:    #98cbff;
-    --code-property:    #e7bdb8;
-    --code-punctuation: #5d3f3c;
-    --code-string:      #98cbff;
+    --code-keyword:     #ffb3b2;
+    --code-operator:    #70d6db;
+    --code-property:    #e8bcbb;
+    --code-punctuation: #5e3f3e;
+    --code-string:      #70d6db;
     --code-tag:         #ffb4ab;
-    --code-value:       #ffb4ac;
+    --code-value:       #ffb3b2;
 
     /* ── Scrollbar ─────────────────────────────────────────── */
     --scrollbar-thumb-bg:           rgba(var(--mat-on-surface-rgb), 0.12);
@@ -121,16 +121,16 @@
 
     /* ── Inputs ────────────────────────────────────────────── */
     --input-shadow: none;
-    --input-shadow-hover: 0 0 0 2px #ae8884;
+    --input-shadow-hover: 0 0 0 2px #ae8786;
 
     /* ── Graph View ────────────────────────────────────────── */
-    --graph-node:           #ffb4ac;
-    --graph-node-unresolved: #ae8884;
-    --graph-node-focused:   #ffffff;
-    --graph-node-tag:       #ffb4ac;
-    --graph-node-attachment: #98cbff;
-    --graph-line:           #5d3f3c;
-    --graph-background:     #200f0d;
+    --graph-node:           #ffb3b2;
+    --graph-node-unresolved: #ae8786;
+    --graph-node-focused:   #000000;
+    --graph-node-tag:       #ffb3b2;
+    --graph-node-attachment: #70d6db;
+    --graph-line:           #5e3f3e;
+    --graph-background:     #200e0e;
 
 }
 
diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 25f4efa..398ba1f 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -13,12 +13,12 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "00 Inbox/29593940 - Formal Languages.md",
+                "file": "00 Inbox/29593952 - Regular Languages.md",
                 "mode": "source",
                 "source": false
               },
               "icon": "lucide-file",
-              "title": "29593940 - Formal Languages"
+              "title": "29593952 - Regular Languages"
             }
           }
         ]
@@ -78,7 +78,7 @@
       }
     ],
     "direction": "horizontal",
-    "width": 200
+    "width": 493.50418853759766
   },
   "right": {
     "id": "8a65bc0c1d4d98f2",
@@ -184,11 +184,15 @@
   },
   "active": "140d404d9b2faf63",
   "lastOpenFiles": [
-    "00 Inbox/29593952 - Regular Languages.md",
-    "00 Inbox/29593940 - Formal Languages.md",
-    "00 Inbox/29593935 - Kleene.md",
-    "30 Library/29593895 - atfl-st2026-l01-formal-languages-full.pdf",
     "00 Inbox/29593852 - Strings.md",
+    "00 Inbox/29593958 - Kleene star of languages.md",
+    "30 Library/29593962 - atfl-st2026-l02-finite-representation-of-languages-full.pdf",
+    "30 Library/normalize_name.sh",
+    "30 Library/atfl-st2026-l02-finite-representation-of-languages-full.pdf",
+    "00 Inbox/29593935 - Kleene.md",
+    "00 Inbox/29593940 - Formal Languages.md",
+    "00 Inbox/29593952 - Regular Languages.md",
+    "30 Library/29593895 - atfl-st2026-l01-formal-languages-full.pdf",
     "00 Inbox/29593929 - Alphabets.md",
     "30 Library/29592593 - ET_II_Folien_gesamt_020426.pdf",
     "30 Library/29592593 - 29592593 - ET_II_Folien_gesamt_020426.pdf",
@@ -214,12 +218,7 @@
     "00 Inbox/29593226 - ET_II_Folien_gesamt_020426.pdf.md",
     "10 Courses/02 - SoSe 2026/ET II/29592722 - Zeitabhängige Größen.md",
     "10 Courses/02 - SoSe 2026/ET II/29592709 - Klausur.md",
-    "10 Courses/02 - SoSe 2026/ET II/29592729 - Kirchhoffsche Gesetze.md",
-    "00 Inbox/29593224 - 29593223 - 29593223 - Elektrotechnik II.md",
     "20 Atlas",
-    "30 Library/ET_II_Folien_gesamt_020426.pdf",
-    "30 Library/d6d88eed747e389e597d2a19bb868ee6?cid=4b45b3a6f32c35a6d9ca5b1b07b760de",
-    "30 Library/wget-log",
     "10 Courses/01 - WiSe 2025_26/ET/images/beispiel_knotenregel.png"
   ]
 }
\ No newline at end of file
diff --git a/00 Inbox/29593958 - Kleene star of languages.md b/00 Inbox/29593958 - Kleene star of languages.md
new file mode 100644
index 0000000..cf1b2b1
--- /dev/null
+++ b/00 Inbox/29593958 - Kleene star of languages.md	
@@ -0,0 +1,25 @@
+---
+created: 2026-04-08 10:38
+course: "[[29593850 - Automationtheory]]"
+topic: kleene
+related: "[[29593940 - Formal Languages]]"
+type: lecture
+status: 🔴
+tags:
+  - university
+---
+## 📌 Summary
+
+> [!abstract]
+> 
+
+---
+
+## 📝 Content
+
+The _Kleene star_ $L^*$ of a language $L subset Sigma^*$ is the set of all strings (including the empty string $epsilon$) that can be generated by arbitrary concatenation of strings in the language, that is
+> $L^* := union.big_(n >= 0) L^n$
+
+> [!EXAMPLE]
+> For $L = {01}$ one has $L^* = {epsilon, 01, 0101, 010101, ...}$
+> $= {(01)^n bar n >= 0}$
diff --git a/30 Library/29593962 - atfl-st2026-l02-finite-representation-of-languages-full.pdf b/30 Library/29593962 - atfl-st2026-l02-finite-representation-of-languages-full.pdf
new file mode 100644
index 0000000..527104e
Binary files /dev/null and b/30 Library/29593962 - atfl-st2026-l02-finite-representation-of-languages-full.pdf differ
diff --git a/30 Library/normalize_name.sh b/30 Library/normalize_name.sh
new file mode 100755
index 0000000..ebef027
--- /dev/null
+++ b/30 Library/normalize_name.sh	
@@ -0,0 +1,36 @@
+#!/bin/bash
+
+# Check if a filename was provided
+if [ -z "$1" ]; then
+    echo "Usage: $0 <filename>"
+    exit 1
+fi
+
+TARGET="$1"
+
+# Check if the file actually exists
+if [ ! -f "$TARGET" ]; then
+    echo "Error: File '$TARGET' not found."
+    exit 1
+fi
+
+# Get creation time (%W).
+# Note: Returns 0 or '-' if the filesystem doesn't support birth time.
+BTIME=$(stat -c %W "$TARGET")
+
+# Fallback to last modification time (%Y) if birth time is unavailable
+if [ "$BTIME" -eq 0 ] || [ "$BTIME" == "-" ]; then
+    BTIME=$(stat -c %Y "$TARGET")
+fi
+
+# Calculate the minute-based timestamp (equivalent to Math.floor(ms / 60000))
+# Since stat returns seconds, we divide by 60.
+FORMATTED_DATE=$(( BTIME / 60 ))
+
+# Define the new name
+NEW_NAME="${FORMATTED_DATE} - ${TARGET}"
+
+# Perform the rename
+mv "$TARGET" "$NEW_NAME"
+
+echo "Renamed: '$TARGET' -> '$NEW_NAME'"