This is pdfTeX, Version 3.14159265-2.6-1.40.15 (TeX Live 2015/dev/Debian) (preloaded format=latex 2015.6.22)  29 NOV 2016 12:24
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**math.tex
(./math.tex
LaTeX2e <2014/05/01>
Babel <3.9l> and hyphenation patterns for 2 languages loaded.
(/usr/share/texlive/texmf-dist/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/usr/share/texlive/texmf-dist/tex/latex/base/size12.clo
File: size12.clo 2014/09/29 v1.4h Standard LaTeX file (size option)
)
\c@part=\count79
\c@section=\count80
\c@subsection=\count81
\c@subsubsection=\count82
\c@paragraph=\count83
\c@subparagraph=\count84
\c@figure=\count85
\c@table=\count86
\abovecaptionskip=\skip41
\belowcaptionskip=\skip42
\bibindent=\dimen102
) (./math.aux)
\openout1 = `math.aux'.

LaTeX Font Info:    Checking defaults for OML/cmm/m/it on input line 4.
LaTeX Font Info:    ... okay on input line 4.
LaTeX Font Info:    Checking defaults for T1/cmr/m/n on input line 4.
LaTeX Font Info:    ... okay on input line 4.
LaTeX Font Info:    Checking defaults for OT1/cmr/m/n on input line 4.
LaTeX Font Info:    ... okay on input line 4.
LaTeX Font Info:    Checking defaults for OMS/cmsy/m/n on input line 4.
LaTeX Font Info:    ... okay on input line 4.
LaTeX Font Info:    Checking defaults for OMX/cmex/m/n on input line 4.
LaTeX Font Info:    ... okay on input line 4.
LaTeX Font Info:    Checking defaults for U/cmr/m/n on input line 4.
LaTeX Font Info:    ... okay on input line 4.
LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <14.4> on input line 5.
LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <7> on input line 5.


LaTeX Warning: No \author given.

LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <12> on input line 9.
LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <8> on input line 9.
LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <6> on input line 9.
! Missing $ inserted.
<inserted text> 
                $
l.10 
     
? 
! Emergency stop.
<inserted text> 
                $
l.10 
     
End of file on the terminal!

 
Here is how much of TeX's memory you used:
 223 strings out of 495021
 2406 string characters out of 6181350
 46971 words of memory out of 5000000
 3520 multiletter control sequences out of 15000+600000
 7588 words of font info for 27 fonts, out of 8000000 for 9000
 14 hyphenation exceptions out of 8191
 22i,6n,19p,110b,193s stack positions out of 5000i,500n,10000p,200000b,80000s
No pages of output.