diff --git a/Localization/extended_kalman_filter/extended_kalman_filter_localization.ipynb b/Localization/extended_kalman_filter/extended_kalman_filter_localization.ipynb
index 1112cc45..5a3b8672 100644
--- a/Localization/extended_kalman_filter/extended_kalman_filter_localization.ipynb
+++ b/Localization/extended_kalman_filter/extended_kalman_filter_localization.ipynb
@@ -1,7 +1,6 @@
 {
  "cells": [
   {
-   "attachments": {},
    "cell_type": "markdown",
    "metadata": {},
    "source": [
@@ -149,7 +148,7 @@
     "\\end{equation*}$\n",
     "\n",
     "$\\begin{equation*}\n",
-    "=\n",
+    "　=\n",
     "\\begin{bmatrix}\n",
     "1& 0 & -v sin(\\phi)dt &  cos(\\phi)dt\\\\\n",
     "0 & 1 & v cos(\\phi)dt & sin(\\phi) dt\\\\\n",