Most of Chapter 2 first pass.

source/docinfo.ptx

@@ -19,7 +19,18 @@
   <!-- macros for defining latex math shortcuts. It is good practice -->
   <!-- to define these semantically, so that the macro relates to what-->
   <!-- it defines. -->
-  <macros> \newcommand{\N}{\mathbb N} \newcommand{\Z}{\mathbb Z} \newcommand{\Q}{\mathbb Q} \newcommand{\R}{\mathbb R} </macros>
+  <macros> 
+    <!-- common number sets -->
+    \newcommand{\N}{\mathbb N} 
+    \newcommand{\Z}{\mathbb Z} 
+    \newcommand{\Q}{\mathbb Q} 
+    \newcommand{\R}{\mathbb R} 
+
+    <!-- named distributions -->
+    \DeclareMathOperator{\Bin}{Bin}
+    \DeclareMathOperator{\Geom}{Geom}
+    \DeclareMathOperator{\Poiss}{Poiss}
+  </macros>
 
   <!-- If you put any latex-image elements you can include preambles -->
   <!-- for those in the next element. -->