This is pdfTeX, Version 3.1415926-2.5-1.40.14 (TeX Live 2013/W32TeX) (format=pdflatex 2013.11.22)  13 DEC 2013 05:53
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**ALIGN.TEX
(./ALIGN.TEX
LaTeX2e <2011/06/27>
Babel <3.9g> and hyphenation patterns for 78 languages loaded.
(c:/texlive/2013/texmf-dist/tex/latex/base/article.cls
Document Class: article 2007/10/19 v1.4h Standard LaTeX document class
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File: size10.clo 2007/10/19 v1.4h Standard LaTeX file (size option)
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Package: amsmath 2013/01/14 v2.14 AMS math features
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For additional information on amsmath, use the `?' option.
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LaTeX Info: Redefining \frac on input line 210.
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LaTeX Info: Redefining \dots on input line 381.
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LaTeX Font Info:    Checking defaults for OML/cmm/m/it on input line 10.
LaTeX Font Info:    ... okay on input line 10.
LaTeX Font Info:    Checking defaults for T1/cmr/m/n on input line 10.
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LaTeX Font Info:    Checking defaults for OMS/cmsy/m/n on input line 10.
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LaTeX Font Info:    Checking defaults for U/cmr/m/n on input line 10.
LaTeX Font Info:    ... okay on input line 10.

Runaway argument?
 1 & 2\\ 3 & 4 \eal 
! Paragraph ended before \align was complete.
<to be read again> 
                   \par 
l.22 
     
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! Missing $ inserted.
<inserted text> 
                $
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! Missing \endgroup inserted.
<inserted text> 
                \endgroup 
l.22 
     
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! Display math should end with $$.
<to be read again> 
                   \par 
l.22 
     
? 

! LaTeX Error: \begin{align} on input line 17 ended by \end{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.24 \end{document}
                   
? 
[1

{c:/texlive/2013/texmf-var/fonts/map/pdftex/updmap/pdftex.map}] (./ALIGN.aux) )

(\end occurred inside a group at level 1)

### semi simple group (level 1) entered at line 17 (\begingroup)
### bottom level 
Here is how much of TeX's memory you used:
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Output written on ALIGN.pdf (1 page, 9711 bytes).
PDF statistics:
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