This is pdfTeX, Version 3.1415926-2.5-1.40.14 (TeX Live 2013/Arch Linux) (format=pdflatex 2013.10.17)  23 OCT 2013 18:45
entering extended mode
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**notations.tex
(./notations.tex
LaTeX2e <2011/06/27>
Babel <3.9f> and hyphenation patterns for 78 languages loaded.
! Undefined control sequence.
l.1 \section
            {Notations and Terminologies}
? 
! Emergency stop.
l.1 \section
            {Notations and Terminologies}
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Here is how much of TeX's memory you used:
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!  ==> Fatal error occurred, no output PDF file produced!