[methods] piecewise funciton definition on CAS

diff --git a/methods/statistics-ref.tex b/methods/statistics-ref.tex
index 4a08282c1eac4e584566676c7f9fb7e44cb87c56..196455f4f6559b2ade4da64913724b3515508f2d 100644 (file)
--- a/methods/statistics-ref.tex
+++ b/methods/statistics-ref.tex
@@ -113,6 +113,11 @@ A continuous random variable \(X\) has a pdf \(f\) such that:
 
 \[ \Pr(X \le c) = \int^c_{-\infty} f(x) \> dx \]
 
+\begin{cas}
+  Define piecewise functions: \\
+  Math3 \(\rightarrow\) 
+  % TODO: finish this section
+\end{cas}
 
 \subsection*{Two random variables \(X, Y\)}