diff --git a/11_Infinite_Seq_and_Series/.ipynb_checkpoints/S11.1_Infinite_Sequences-checkpoint.ipynb b/11_Infinite_Seq_and_Series/.ipynb_checkpoints/S11.1_Infinite_Sequences-checkpoint.ipynb
index c1c73df..a5f59ab 100644
--- a/11_Infinite_Seq_and_Series/.ipynb_checkpoints/S11.1_Infinite_Sequences-checkpoint.ipynb
+++ b/11_Infinite_Seq_and_Series/.ipynb_checkpoints/S11.1_Infinite_Sequences-checkpoint.ipynb
@@ -8,7 +8,7 @@
     "\n",
     "\n",
     "## Mathematics Definition of Sequence\n",
-    "A sequence is defined as: a __function whose domain is the set of positive integers__.\n",
+    "A sequence is defined as: __a function whose domain is the set of positive integers__.\n",
     "\n",
     "\n",
     "**Notation**\n",
diff --git a/11_Infinite_Seq_and_Series/S11.1_Infinite_Sequences.ipynb b/11_Infinite_Seq_and_Series/S11.1_Infinite_Sequences.ipynb
index c1c73df..a5f59ab 100644
--- a/11_Infinite_Seq_and_Series/S11.1_Infinite_Sequences.ipynb
+++ b/11_Infinite_Seq_and_Series/S11.1_Infinite_Sequences.ipynb
@@ -8,7 +8,7 @@
     "\n",
     "\n",
     "## Mathematics Definition of Sequence\n",
-    "A sequence is defined as: a __function whose domain is the set of positive integers__.\n",
+    "A sequence is defined as: __a function whose domain is the set of positive integers__.\n",
     "\n",
     "\n",
     "**Notation**\n",