change unknown character

chandinijain · chandinijain · commit 68942d594a36 · 2017-02-27T03:58:58.000+05:30
diff --git a/Time Series Analysis - 1.ipynb b/Time Series Analysis - 1.ipynb
@@ -88,7 +88,7 @@
     "\n",
     "*Mean of a time series $x_t$ is $E(x_t)=\\mu(t)$*\n",
     "\n",
-    "*Variance of a time series $x_t$ is $\\sigma^2(t)=E[(x_t−\\mu(t))^2]$*\n",
+    "*Variance of a time series $x_t$ is $\\sigma^2(t)=E[(x_t - \\mu(t))^2]$*\n",
     "\n",
     "**A time series is stationary in the mean if $\\mu(t)=\\mu$, i.e.mean is constant with time**\n",
     "\n",
