This is TeX, C Version 3.141 (format=plain 96.11.12)  6 JUN 1997 16:46
**em1517
(em1517.tex
! Missing $ inserted.
<inserted text> 
                $
<to be read again> 
                   ^
l.19 ...h $n-1 to equal the lower $n-2$ rows of $^
                                                  {\theta t}M_{n-1}$.
? 
! Emergency stop.
<inserted text> 
                $
<to be read again> 
                   ^
l.19 ...h $n-1 to equal the lower $n-2$ rows of $^
                                                  {\theta t}M_{n-1}$.
End of file on the terminal!

No pages of output.