Rewrites for orthogonal version of eqns

The changes in the univariate chapter, where I derived the
eqn for K continue to ripple through the chapters.

pdf/build_book

@@ -1,7 +1,7 @@
 #! /bin/bash
 
 #echo "merging book..."
-python merge_book.py
+ipython merge_book.py
 
 echo "creating pdf..."
 ipython nbconvert --to latex --template book book.ipynb