deletions | additions       diff --git a/Introduction.tex b/Introduction.tex  index bb48a52..8bc9674 100644  --- a/Introduction.tex  +++ b/Introduction.tex 
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\begin{eqnarray}  \label{e.position_bat}  \textbf{x}_i^{t+1} & = & \left\{ \begin{array}{ll} \tilde{\textbf{x}}_i^{t+1} & \mbox{{ if $f(\tilde{\textbf{x}}_i^{t+1})$\x^i $x^i  \\ \textbf{x}^{t+1} & \mbox{{ otherwise}}  \end{array}\right.  \end{eqnarray}