update math refresher

slides/mathrefresher/slides-probability-theory.tex

@@ -18,7 +18,7 @@
 \begin{document}
 
 \titlemeta{% Chunk title (example: CART, Forests, Boosting, ...), can be empty
-    Supervised Learning
+    %Supervised Learning
   }{% Lecture title  
     Refreshing Mathematical Tools
   }{% Relative path to title page image: Can be empty but must not start with slides/