This is pdfTeX, Version 3.1415926-1.40.10 (TeX Live 2009/Debian) (format=latex 2012.8.23)  19 SEP 2012 09:29
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**_formulas.tex
(./_formulas.tex
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l.68 ...}{c} \dot{a} \\ \dot{b} \end{array\right]}
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! Missing \endgroup inserted.
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                \endgroup 
l.68 ...}{c} \dot{a} \\ \dot{b} \end{array\right]}
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\end #1->\csname end#1\endcsname 
                                 \@checkend {#1}\expandafter \endgroup \if@e...
l.68 ...}{c} \dot{a} \\ \dot{b} \end{array\right]}
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! LaTeX Error: \begin{document} ended by \end{array\right ]}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.68 ...}{c} \dot{a} \\ \dot{b} \end{array\right]}
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! Missing $ inserted.
<inserted text> 
                $
l.68 ...}{c} \dot{a} \\ \dot{b} \end{array\right]}
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! Display math should end with $$.
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l.68 ...}{c} \dot{a} \\ \dot{b} \end{array\right]}
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! Extra \endgroup.
<recently read> \endgroup 
                          
l.68 ...}{c} \dot{a} \\ \dot{b} \end{array\right]}
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! LaTeX Error: Bad math environment delimiter.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.68 ...} \dot{a} \\ \dot{b} \end{array\right]} \]
                                                  
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[37] (./_formulas.aux) ) 
Here is how much of TeX's memory you used:
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Output written on _formulas.dvi (37 pages, 6120 bytes).