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<DIV><FONT face=Arial size=2>I am in despair. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I am writing a book in LaTex, and have already 239
pages, and, unfortunately, today - I do not know what happened and what I did
wrong - suddenly I cannot transform my LaTex text into DVI, and the PDF file
disappeared completely. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have the LaTex text, the DVI and the PDF stored
on two USB sticks but unfortunately I did not update it every day but for the
last time about four weeks ago (in the future I will be more prudent), and
all my work I did in the meantime seems to be lost!!!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I had the information: <U>This is a bad DVi file.
The DVI file cannot be processed because it is not valid. </U></FONT></DIV>
<DIV><U><FONT face=Arial size=2></FONT></U> </DIV>
<DIV><FONT face=Arial size=2>I write a book on the history of mathematics and
the Italian mathematician Rafael Bombelli (1526-1572) used his own symbol for
the powers of the unknown. He used an arc, a semi-circle, above open, and there
he wrote the power, 1, 2, 3 etc.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Some expert told me how to represent Bombelli's arc
in LaTex: For example for 7x² I wrote 7\underarc2, and in DVI and PDF the arc
with the 2 inside appeared. I used this symbol quite often. I do not know what I
did in the preamble to make this command work. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Now when I click on the icon LaTex I read in
the black box:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>!Undefined control sequence.</FONT></DIV>
<DIV><FONT face=Arial size=2>1.1427. \begin<quote|> 1\underarc3 be equal
6\underarc3... (That is, I have to arcs in line 1427.)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Am I right that if I delete all
\underarcs in my text my file would be in order again? But I have so many that
it is hopeless. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Has something happened to my preamble that
\underarc is not accepted any more? </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Have you any idea how I could restore my DVI and
PDF?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2><U>I would be very very grateful for a solution of
my problem!</U></FONT></DIV>
<DIV><U><FONT face=Arial size=2></FONT></U> </DIV>
<DIV><FONT face=Arial size=2>Dr. Friedrich Katscher, Vienna, Austria, an expert
in Italian mathematics of the 16th century but unfortunately not in
LaText</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
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