diff --git a/pages/Math4121/Math4121_L16.md b/pages/Math4121/Math4121_L16.md
index 1e4019c..3751410 100644
--- a/pages/Math4121/Math4121_L16.md
+++ b/pages/Math4121/Math4121_L16.md
@@ -73,7 +73,7 @@ A set is uncountable if it is not countable.
 
 #### Theorem: $\mathbb{R}$ is uncountable
 
-Easy proof using[Cantor's diagonal argument](https://notenextra.trance-0.com/Math4111/Math4111_L6#theorem-214).
+Easy proof using [Cantor's diagonal argument](https://notenextra.trance-0.com/Math4111/Math4111_L6#theorem-214).
 
 A new one
 
diff --git a/pages/Math4121/_meta.js b/pages/Math4121/_meta.js
index a5a8896..29d9f95 100644
--- a/pages/Math4121/_meta.js
+++ b/pages/Math4121/_meta.js
@@ -16,18 +16,10 @@ export default {
     Math4121_L11: "Introduction to Lebesgue Integration (Lecture 11)",
     Math4121_L12: "Introduction to Lebesgue Integration (Lecture 12)",
     Math4121_L13: "Introduction to Lebesgue Integration (Lecture 13)",
-    Math4121_L14: {
-        display: 'hidden'
-    },
-    Math4121_L15: {
-        display: 'hidden'
-    },
-    Math4121_L16: {
-        display: 'hidden'
-    },
-    Math4121_L17: {
-        display: 'hidden'
-    },
+    Math4121_L14: "Introduction to Lebesgue Integration (Lecture 14)",
+    Math4121_L15: "Introduction to Lebesgue Integration (Lecture 15)",
+    Math4121_L16: "Introduction to Lebesgue Integration (Lecture 16)",
+    Math4121_L17: "Introduction to Lebesgue Integration (Lecture 17)",
     Math4121_L18: {
         display: 'hidden'
     },