deletions | additions       diff --git a/header.tex b/header.tex  index 83e3ea3..7945789 100644  --- a/header.tex  +++ b/header.tex 
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%\def\beq{\begin{equation}}  %\def\eeq{\end{equation}}  %\def\ba{\begin{eqnarray}}  %\def\ea{\end{eqnarray}}  %\def\bal{\begin{align}}  %\def\eal{\end{align}}  %\def\bxi{{\mbox{\boldmath \def\beq{\begin{equation}}  \def\eeq{\end{equation}}  \def\ba{\begin{eqnarray}}  \def\ea{\end{eqnarray}}  \def\bal{\begin{align}}  \def\eal{\end{align}}  \def\bxi{{\mbox{\boldmath  $\xi$}}} %\def\bnab{{\mbox{\boldmath \def\bnab{{\mbox{\boldmath  $\nabla$}}} %\def\calP{{\cal \def\calP{{\cal  P}}