This is pdfTeX, Version 3.1415926-1.40.11 (TeX Live 2010) (format=pdflatex 2010.7.21) 25 APR 2011 13:50 entering extended mode restricted \write18 enabled. %&-line parsing enabled. **sagebook. ! Emergency stop. <*> sagebook. End of file on the terminal! Here is how much of TeX's memory you used: 4 strings out of 493747 103 string characters out of 3143546 49070 words of memory out of 3000000 3397 multiletter control sequences out of 15000+200000 3640 words of font info for 14 fonts, out of 3000000 for 9000 714 hyphenation exceptions out of 8191 0i,0n,0p,1b,6s stack positions out of 5000i,500n,10000p,200000b,50000s ! ==> Fatal error occurred, no output PDF file produced!