diff --git a/c_os/lib/MyMath.cc b/c_os/lib/MyMath.cc
deleted file mode 100755
index d52df8b..0000000
--- a/c_os/lib/MyMath.cc
+++ /dev/null
@@ -1,26 +0,0 @@
-#include "MyMath.h"
-
-// NOTE: I added this file
-
-int mmath::min(int a, int b) {
-    if (a < b) { return a; }
-    return b;
-}
-
-int mmath::max(int a, int b) {
-    if (a < b) { return b; }
-    return a;
-}
-
-int mmath::abs(int a) {
-    if (a < 0) { return -a; }
-    return a;
-}
-
-int mmath::pow(int a, unsigned int b) {
-    int result = 1;
-    for (unsigned int i = 0; i < b; ++i) {
-        result = result * a;
-    }
-    return result;
-}
diff --git a/c_os/lib/MyMath.h b/c_os/lib/MyMath.h
deleted file mode 100755
index 859156e..0000000
--- a/c_os/lib/MyMath.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef __MYMATH_INCLUDE_H_
-#define __MYMATH_INCLUDE_H_
-
-// NOTE: I added this file
-
-namespace mmath {
-    int min(int, int);
-    int max(int, int);
-    int abs(int);
-    int pow(int, unsigned int);
-}  // namespace mmath
-
-#endif