diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 50c85a2..01ae2cb 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -13,7 +13,7 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "UNB/Year 4/Semester 2/CS3873/2024-01-24.md",
+                "file": "UNB/Year 4/Semester 2/CS2333/2024-01-24.md",
                 "mode": "source",
                 "source": false
               }
@@ -85,7 +85,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "UNB/Year 4/Semester 2/CS3873/2024-01-24.md",
+                "file": "UNB/Year 4/Semester 2/CS2333/2024-01-24.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -102,7 +102,7 @@
             "state": {
               "type": "outgoing-link",
               "state": {
-                "file": "UNB/Year 4/Semester 2/CS3873/2024-01-24.md",
+                "file": "UNB/Year 4/Semester 2/CS2333/2024-01-24.md",
                 "linksCollapsed": false,
                 "unlinkedCollapsed": true
               }
@@ -125,7 +125,7 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "UNB/Year 4/Semester 2/CS3873/2024-01-24.md"
+                "file": "UNB/Year 4/Semester 2/CS2333/2024-01-24.md"
               }
             }
           },
@@ -158,8 +158,9 @@
   },
   "active": "81e5aff710e811bc",
   "lastOpenFiles": [
-    "UNB/Year 4/Semester 2/CS3873/2024-01-22.md",
     "UNB/Year 4/Semester 2/CS3873/2024-01-24.md",
+    "UNB/Year 4/Semester 2/CS2333/2024-01-24.md",
+    "UNB/Year 4/Semester 2/CS3873/2024-01-22.md",
     "UNB/Year 4/Semester 2/STAT2593/2024-01-24.md",
     "UNB/Year 4/Semester 2/CS2333/2024-01-22.md",
     "UNB/Year 4/Semester 2/CS2333/2024-01-19.md",
@@ -190,7 +191,6 @@
     "Semester 1/CS3418/11-15-2023.md",
     "Semester 1/CS3418/11-13-2023.md",
     "Semester 1/CS3418/11-1-2023.md",
-    "Semester 1/CS2418/10-27-2023.md",
     "Semester 1/CS2418",
     "Semester 1/CS3418"
   ]
diff --git a/UNB/Year 4/Semester 2/CS2333/2024-01-24.md b/UNB/Year 4/Semester 2/CS2333/2024-01-24.md
new file mode 100644
index 0000000..e286f20
--- /dev/null
+++ b/UNB/Year 4/Semester 2/CS2333/2024-01-24.md	
@@ -0,0 +1,49 @@
+Lecture Topic:
+
+# Equivalence Classes
+You can represent equivalence classes by writing each one as a set:
+$$C_0 = \{..., -10, -5, 0, 5, 10, 15, ...\} \text{ or } \{5p | p \in \mathbb{Z}\}$$
+$$C_0 = \{..., -9, -4, 1, 6, 11, 16, ...\} \text{ or } \{5p + 1| p \in \mathbb{Z}\}$$
+$$\text{and so on...}$$
+# Graphs
+Definitions:
+- For each *vertex* v, the **degree** of v is the number of edges incident on v
+- A *path* is a **sequence** of vertices connected by edges
+- A *cycle* is a path that **starts and ends** at the same vertex
+- A *simple path* is a path that has **no repeated** vertices
+- A *connected graph* contains a path between **every pair** of vertices
+- A *disconnected graph* is the opposite (look at slides for real def)
+
+# Regular Languages
+A class of languages that can be processed by simple computers called **finite automata**
+
+## Simple Example of a finite automaton
+Vending machine/toll booth gate
+Requires 25 cents or more to be deposited (gives no change)
+
+Takes as input, 5 cent, 10 cent, 25 cent coins
+Uses **states** to remember how much has been deposited so far
+
+States:
+- q_0 : 0 cents deposited (START STATE)
+- q_5 : 5 cents
+- q_10 : 10 cents
+- q_15 : 15 cents
+- q_20 : 20 cents
+- q_25 : 25 cents (ACCEPT STATE)
+
+We represent the input as a **string** of symbols.
+- n = nickel
+- d = dime
+- q = quarter
+Examples:
+- ddn
+- ndd
+- dnd
+- q
+Not accepted examples:
+- nd
+- d
+- $\epsilon$
+## State Diagram
+(not really possible without an image in obsidian)
\ No newline at end of file